171 results about "Condensation heat transfer" patented technology

The invention provides a condensation heat-transfer experiment device capable of realizing the coupling of natural circulation and forced circulation. The condensation heat-transfer experiment device mainly comprises a steam supply system, an air supply system, a helium gas supply system, a natural circulation cooling system, a forced circulation cooling system, a condensing experiment body and a data measurement and acquisition system. The non-condensable gas containing extra-steam-pipe external condensation heat transfer experiment research under natural circulation and forced circulation cooling conditions and the experiment research on the heat extraction and flow characteristics of a natural circulation system under the conditions that the heating power is stable and changed can be realized. The device can monitor the experiment data in real time and continuously measure the condensation characteristics under different mixed gas compositions, and therefore, the device carries out measurement accurately and carries out data processing rapidly. In addition, the degree of visibility of a whole system is extremely high; and through the observation on experimental phenomena, the understanding on experimental processes and the in-depth study on heat transfer and flow mechanisms are facilitated.

The electronic component with heat transfer by boiling and condensation comprises heat exchange surfaces immersed in a heat conducting fluid constituted by the free ends of nanowires of a thermoelectric converter. An electrically insulating coating material with a low thermal conduction partially covers the nanowires above the heat conducting fluid. Each nanowire forms a thermocouple composed of two coaxial branches made from materials of different natures separated by a layer of electrically insulating material and electrically connected individually to the free end of the nanowire.

The invention relates to a micro-droplet self-transported wedged non-uniform ultra-wetting surface and a preparation method thereof. A super-hydrophobic surface containing titanium dioxide or zinc oxide nano-materials is constructed on the surface of a substrate by using a coating spraying or hydrothermal oxidation method, and a template method is used, ultraviolet light catalysis or oxygen plasma region selective modification is carried out to obtain a wedged super-hydrophilic region, the template method also can be used to obtain a wedged covering region, and then the coating spraying or hydrothermal oxidation method can be used again, and region selection is carried out to construct the super-hydrophobic surface, so as to obtain the wedged non-uniform ultra-wetting surface, finally, the wedged region is further modified by using polyvinyl alcohol again to obtain a bulge of the smooth super-hydrophilic wedged region, so that micro-droplets can be transported spontaneously in the wedged region without external force driving. By selecting the region of a template, the wedged super-hydrophilic region arranged in an array can be obtained on the super-hydrophobic surface, and multiple micro-droplets are in self-propelled movement by one time, so that the micro-droplet self-transported wedged non-uniform ultra-wetting surface has broad application prospects in fields of condensation heat transfer enhancement or evaporation heat transfer, fog catchment, microfluid and the like.

Condenser structures and cooling apparatuses are provided which facilitate vapor condensation heat transfer of a coolant employed in cooling an electronic device. The condenser structure includes a thermally conductive condenser block with multiple exposed cavities therein extending from a first main surface towards a second main surface. The condenser block is a monolithic structure, and the first main surface is a coolant vapor condensate formation surface when the condenser structure is operationally facilitating cooling of an electronic device. The exposed cavities extend from the first main surface into the condenser block to increase a condensation surface area of the condenser block, thereby facilitating coolant vapor condensate formation on the condenser block, and thus cooling of the electronic device using a two-phase coolant. The condenser structure also includes coolant-carrying channels for facilitating cooling of the condenser block, and thus vapor condensate formation on the condenser block.

The invention provides a multiple effective reflux falling film evaporation system used for recycling organic solvent. The invention is mainly used for recycling the solvent in water solution of the organic solvent during the concentration production process of plant extractions in food industry and biopharmaceutical industry. The invention adopts falling film evaporators with high heat transmission coefficient and small terminal temperature difference to form the multiple effective evaporation system. Each evaporator is provided with a solution circulating pump which increases down-flow quantity in a heat transfer tube and avoids dry wall of a heat transfer surface and enhances heat transferring, thus having great evaporation ability and high efficiency. The condensate of each evaporator enters into a corresponding condensate tank respectively and is discharged by the pump and recycled. A gas-phase communicating pipe is arranged between the condensate tank and a gas-liquid separator, which guarantees the discharge of noncondensable gas under vacuum operation condition, thus being beneficial for improving condensing and heat transferring efficiency. The invention is a new technique, new technology and new device used in concentration process of the extractions of the organic solvent and used for recycling solvent, which has high recycling rate, little energy consumption and convenient operation and can use a vacuum low temperature evaporation concentration production device in continuous and intermittent production operation.

The invention discloses a hydrophobic surface, a preparation method and application thereof in dropwise condensation heat transfer, and relates to the fields of micro-nano manufacturing, condensation heat transfer and the like. The hydrophobic surface has a micro-nano two-level structure, wherein the micro-nano two-level structure is anisotropic and the hydrophobic surface has anisotropic wettability. On one hand, the micro-nano two-level structure of the hydrophobic surface can promote realization of dropwise condensation, and can significantly improve the heat transfer efficiency compared with the common filmwise condensation,; on the other hand, the anisotropic wettability of the hydrophobic surface can affect condensation and fall of water drops to a certain extent and can accelerate discharge of liquid drops under the influence of gravity and other factors, thereby further improving the condensation heat transfer efficiency.

The invention relates to a test system for evaluating the local condensing heat transfer performance of mixed steam. The test system comprises a steam system, a cooling water loop and a data collection system, wherein an air compressor and an air drier of the steam system are connected, air enters a gas mixer together with steam in a boiler after passing through the air drier, and mixed gas enters a test section after being sufficiently mixed in the gas mixer; a water pump of the cooling water loop is used for conveying cooling water to the test section through a flowmeter from a water channel, a cooling water outlet of the test section is connected with an auxiliary cooling device, and the auxiliary cooling device is then connected with the water channel; four valves are arranged at the inlets and outlets of the test section, and are used for controlling the flow rates and pressures of the steam and cooling water respectively. The influence of non-condensable gas on condensation inside a horizontal light pipe can be evaluated by contrasting local condensing heat transfer coefficients.

The invention relates to a preparation method for a carbon nanotube super-hydrophobic coating. The preparation method comprises the following steps: after pickling a substrate to remove surface oxides, successively ultrasonically cleaning the substrate for 15min with acetone, anhydrous ethanol and deionized water to remove surface oil stains and dust and drying the substrate with cold air for later use; ultrasonically dispersing multiwalled carbon nanotubes containing hydroxyl in an isopropanol solution, and adding ammonia water and deionized water drop by drop; after uniformly stirring the solution, adding tetraethoxysilane; after a reaction for a period of time, dropwise adding a silane solution and continuously stirring the mixture; finally obtaining a carbon nanotube super-hydrophobic coating solution; and spraying the carbon nanotube super-hydrophobic coating solution to the substrate, and drying the substrate to obtain the carbon nanotube super-hydrophobic coating. The super-hydrophobic coating with low adhesive ability has the characteristics of being self-cleaned and resisting pollution, condensation and frosting. The preparation method provided by the invention is simple in preparation process and low in cost, can realize large scale production, and has a wide application prospect and a huge market benefit in the aspects of condensing heat transfer, sea water desalination, air source heat pump and the like.

The invention discloses an internal crossing external spiral three-dimensional rhombus rib dual-side strengthening heat transfer tube and comprises a base body of the heat transfer tube, a rhombus rib outside the tube and a spiral groove in the tube. The base body of the heat transfer tube, the rhombus rib outside the tube and the spiral groove in the tube are integrated into a whole and the rhombus rib outside the tubes are disconnected with each other and are distributed in a spiral way along the axial direction to form a three-dimensional expanding surface on the whole external surface of the tube wall; the spiral groove are distributed in the base body of the heat transfer tube in a cross way and are presented in pairs along the direction of turning on the left and the right side. With the three-dimensional rhombus rib out of the tube, the invention increases heat transfer area while damaging a stagnant boundary layer and improving the convective heat transfer coefficient and the condensation heat transfer coefficient, meanwhile, the spiral groove cross-distributed in the tube can induce second separation flow and promote the intensification of turbulent extent while improving the convective heat transfer coefficient in the tube and increasing the capability of scale resistance. In addition, the invention has wide application range and compact structure as well as metal material saving under the same condition of heat transfer.

The invention belongs to the technical field of condensation heat transfer; a multi-functional visualization experimental device for steam condensation heat transfer and frosting process includes a vacuum environment system, a visualization system, a steam generation system, a gas supply system, a cooling system, a data acquisition and control system, an experimental sample and a fixture. The multi-functional visualization experimental device is a device capable of completing various steam condensation and frosting experiments; the device can be used for studying the influence of the content of multi-component non-condensable gas on condensation heat transfer, the influence of a material or surface structure on condensation heat transfer with or without non-condensable gas, condensation heat transfer with variable steam pressure and frosting phenomena and the like. At the same time, the shape of experimental samples is not needed, the observation viewing angle is large, and side shooting and high-angle shooting can be carried out at the same time.

The invention relates to a high-efficiency gravity heat pipe and a manufacturing method thereof. The high-efficiency gravity heat pipe comprises an evaporating section, a heat insulating section and a condensing section, and is characterized in that a metal powder porous layer is sintered on the inner surface of the heat tube evaporating section, and the condensing section is chemically coated. The heat tube manufactured by the process method in the invention can simultaneously reinforce boiling heat transfer and condensing heat transfer, so that a plurality of ideal vaporization cores are artificially increased, thus the boiling phenomenon of the liquid is continuously carried out to achieve a purpose of reinforcing the boiling heat transfer; on the other hand, the surface of a chemical coating of the heat tube condensing section is modified to acquire a low surface free energy value; simultaneously, the coating layer is a metal-based coating layer with good thermal conductivity, thus the condensing heat transfer can be reinforced; from the above, the high-efficiency gravity heat tube reinforce the boiling and condensing effects very remarkably, has the characteristics of good heat transfer reinforcing effect, high production efficiency, low cost and the like.

The invention discloses a plate-type condenser with a liquid separation function. The plate-type condenser with the liquid separation function comprises a front pressing plate, a rear pressing plate and a middle heat exchange module. The front pressing plate and the rear pressing plate are installed on two sides of the middle heat exchange module respectively. The middle heat exchange module is provided with a cooling water runner and a steam runner. The plate-type condenser with the liquid separation function has the beneficial effects that liquid separation is carried out in time, condensate liquid is removed, the thickness of the liquid film of the condensate liquid is effectively reduced, the condensation heat transferring resistance is reduced, and the heat exchange effect of the plate-type condenser is effectively improved; no moving component is included, so that the operation failure rate is small, and reliability is high; the basic structural characteristics of a common plate-type condenser are kept, and the advantages of being good in compactness, small in occupied space, high in heat transferring coefficient and flexible to assemble and use of the common plate-type condenser are inherited; a split-ranging cooling concept is adopted, and the temperature and flow amount of cooling liquid are distributed in a split-ranging mode specific to the change rules of the temperature curve in the process of condensation and heat exchange, so that the temperature matching relationship is more reasonable, the heat transferring temperature difference is effectively reduced, and the exergy loss of the heat exchanger is reduced.

The invention discloses a control method and device for a condensation heat-transferring property of a super-hydrophobic surface. The control method is characterized by comprising the following steps: modifying the surface of a condensation heat exchanger into a super-hydrophobic surface with a micro structure; utilizing a device which comprises a computer, a control module and a realizing moduleto firstly realize dropwise condensation; and applying mechanical bandwidth micro-vibration to the main body of the condensation heat exchanger so as to compel a condensate water drop in a certain size or within a certain size scope to quickly drop from the surface of the condensation heat exchanger, thereby achieving the purpose of controlling the dropwise condensation heat-transferring property. The control method has the beneficial effects that the condensation heat transfer can be strengthened while the strength of heat exchange property is controlled. By applying micro-vibration to a heat exchange surface, the wetting state of the condensate water drop is changed and the condensate water drop can easily drop from the heat exchange surface; and simultaneously, the applied mechanical vibration is wide-frequency vibration which acts on condensate water drops in different sizes. The control on the dropwise condensation heat-transferring strength is realized by controlling a dropping diameter in a dropwise condensation process.

The invention discloses a titanium alloy super hydrophobic-super hydrophilic surface. Multiple sub arrays are distributed on the surface of a titanium alloy. Multiple super hydrophobic areas and multiple super hydrophilic areas in each sub array are arranged alternately in a wedge shape or a triangular shape, and super hydrophilic gathering areas are distributed between the sub arrays. The super hydrophobic surface has the good super hydrophobic performance, drop adhesion is very little, and rolling is extremely easy; drops can be adsorbed by the super hydrophilic areas, the drops at the top ends of the super hydrophilic areas in the wedge shape or the triangular shape can rapidly move towards the bottom of the wedge shape or the triangular shape under the drive of Plath pressure generatedby the wedge shape or the triangular shape, the super hydrophilic areas arranged alternately with the super hydrophilic areas can repel directional transportation of the drops, under the synergisticeffect of the super hydrophobic areas and the super hydrophilic areas, the condensation small drops can be gathered into the hydrophilic gathering area constantly, high-concentration-ratio self-driving water gathering is achieved, disengaging of the drops is accelerated, and therefore the condensation heat transfer efficiency is improved. The invention provides a preparing method and application of the titanium alloy super hydrophobic-super hydrophilic surface.

The invention relates to a system for evaluating a condensation heat transfer effect. The system comprises a test section, a steam generation system, a cooling water system, an auxiliary condensation system, a data acquisition and monitoring system and a visual observation system, wherein the test section consists of a condensation chamber and a cooling chamber. An evaluating device of the invention can comprehensively evaluate the condensation heat transfer effect of a metal surface through test data, the condensation shape of steam on the metal surface, the dynamic behavior of a liquid film/liquid drop and the like.

A U-shaped tubular condenser of a vertical type spiral baffle plate comprises a shell body component, a tube bundle component, an upper head component and the like. A downstream edge of a fan-shaped baffle plate of a spiral baffle plate set of the tube bundle component is bent upwards to form a liquid blocking weir which is arranged among rows of tubes. An upstream liquid dredging opening and a downstream liquid dredging opening are formed in an arc-shaped edge of the fan-shaped baffle plate. An inclination angle of the fan-shaped baffle plate is reduced in sections from top to bottom. The spiral baffle plate set can be a two-head spiral or a three-head spiral. The fan-shaped baffle plate not only supports the tube bundle, but also is in favor of drying the surface of the tube bundle by scraping, guides condensing liquid to the inner wall of the shell body, discharges the condensing liquid to the bottom portion along the wall surface, enables a tube which is arranged under the baffle plate to directly contact steam through the dry surface and improves condensation heat transfer coefficient. The U-shaped tubular condenser of the vertical type spiral baffle plate enables the heat transfer coefficient of the vertical type shell-and-tube condenser which has the advantages of being small in occupied area, enabling the tube bundle to be conveniently taken out and being convenient to repair to be improved.

The invention provides a pressure release condensation heat transfer system for a passive nuclear power station. The system includes a steam header connected to a main automatic dropping valve and a closed natural circulation loop; the closed natural circulation loop includes a passive steam condensate heat exchanger, a heat transfer loop pipeline, a passive heat exchanger outside the shell and a heat transfer medium. The steam header is in a containment; the top of the steam header is provided with a steam discharge pipeline; the bottom of steam header is provided with a condensate water discharge pipeline; the heat transfer loop pipeline runs through the steam header and the containment; the passive steam condensate heat exchanger is arranged in the steam header and communicated with the heat transfer loop pipeline; the passive heat exchanger outside the shell is arranged outside the containment and communicates with the heat transfer loop pipeline; and the heat transfer medium absorbs heat from the passive steam condensate heat exchanger and transfers the heat to the passive heat exchanger outside the shell through the heat transfer loop pipeline, thereby establishing the closed natural circulation to facilitate continuous removal of core waste heat produced by core residue fission in the case of an accident.

The invention relates to a tube refrigerant oil-bearing evaporation/condensation heat transfer testing integrated device and a test method thereof. The device is characterized by comprising a refrigerant loop, a lubricating oil injection loop and an evaporation/condensation test section heat transfer loop, wherein the refrigerant loop is formed by sequentially connecting a condenser, a recycling tank, a power pump, a regulation valve, a refrigerant mass flow meter, a uniform mediating tank, an evaporation preheating/condensation preheating parallel selection channel, an evaporation/condensation test section, a heater, a high efficiency oil separator and another condenser through pipelines; the lubricating oil injection loop is formed by sequentially connecting a high efficiency oil separator, an oil storage device, a high pressure oil pump, a lubricating oil mass flow meter, a control valve, a uniform mediating tank, an evaporation preheating/condensation preheating parallel selection channel, a refrigerant evaporation/condensation test section, a heater and another high efficiency oil separator through pipelines; and the evaporation/condensation test section heat transfer loop is formed by sequentially connecting a heat exchanger, a water heater, a water pump and a water mass flow meter through pipelines. The invention can carry out tube evaporation/condensation heat transfer testing on different refrigerants and the testing of the influence on the evaporation and condensation heat transfer characteristics of a heat exchange tube and is convenient and reliable.

The invention discloses a stainless steel super-hydrophobic and super-hydrophilic surface. Multiple sub arrays are distributed on the surface of stainless steel. Multiple super-hydrophobic areas and multiple super-hydrophilic areas in each sub array are arranged alternately in wedge shapes or triangular shapes. Super-hydrophilic gathering areas are districted among the sub arrays. The super-hydrophobic surface is excellent in super-hydrophobic performance; liquid drops are quite small in adhesion and can fall off quite easily; the super-hydrophilic areas can adsorb the liquid drops, the liquiddrops at the top ends of the wedge shapes or the triangular shapes can be driven by the plus force generated by the wedge shapes or the triangular shapes to move automatically and rapidly toward thebottoms of the wedge shapes or the triangular shapes; the super-hydrophobic areas which are alternate with the super-hydrophilic areas can repel oriented output of the liquid drops; the super-hydrophilic areas and the super-hydrophobic areas achieve the synergistic effect, so that the condensed small liquid drops are continuously gathered to a hydrophilic gathering area, and high-concentration self-drive water collection is achieved; falling of the liquid drops is accelerated, and thus, the condensation heat transfer efficiency is improved. The invention further provides a preparation method and application of the stainless steel super-hydrophobic and super-hydrophilic surface.

The invention discloses a rotating platform condensation heat transfer experimental device and a rotating platform condensation heat transfer experimental method. According to the method, an operating state of a drying cylinder can be accurately simulated. Various thermal parameters of a channel are transmitted to a computer in a wireless transmission mode, and the rotating speed of a rotating disc can be adjusted, so that the drying cylinders with different speeds can be simulated. The device consists of a constant temperature chamber, a vertical rotating platform and a condensation heat transfer experimental section applied to the platform, wherein the condensation heat transfer experimental section is divided into two parts, namely a steam section and a cooling agent section. According to the device and the method, a steam condensation phenomenon in the cylinder in the process of operating the drying cylinder can be accurately simulated.

The utility model relates to a liquid delivery machine of the condensing pipe which is used as a liquid baffle to reduce the thickness of the condensate film outside a heat exchange pipe in a shell-and-tube heat exchanger. The condensing pipe of the prior art fails to solve the problems that the condensate drips from the upper pipe in the horizontal pipe bundle of horizontal condensation heat exchanger, which increases the thickness of the condensate film of the lower pipe and degrades the heat exchanging performance, the tube bundle effect and that the condensate converges at the bottom and increases the film thickness of the condensing pipe and the heat resistance so as to decrease the heat exchanging capacity. The utility model comprises a liquid delivery tank 1, a planar and continuous drainage plate 2 at the upper part of the liquid delivery tank 1 with a curved surface, a snap spring 3, a pin 4 and a condensing pipe 5; wherein, the delivery tank 1 and the drainage plate 2 are fixed on the condensing tube 5 by the snap spring 3 and the pin 4. The utility model can be used widely in various horizontal outside condensation heat transfer devices in the fields of petroleum, chemical industry, metallurgy, pharmacy, air-conditioning, refrigeration, heating and other fields.

The invention discloses a multistage liquid-separation plate-type condenser. The multistage liquid-separation plate-type condenser comprises a front end cover plate, a rear end cover plate, a heat transferring plate, a water-side sealing gasket and an steam-side sealing gasket, wherein the water-side sealing gasket and the steam-side sealing gasket are located at the tow sides of the heat transferring plate respectively and form a steam flow channel and a cooling water flow channel with the adjacent heat transferring plate, the front end cover plate, or the rear end cover plate, several liquid-separation sealing strips are arranged in the steam-side sealing gasket, the water-side sealing gasket forms a condensate groove with the adjacent heat transferring plate or the front end cover plate, and the lower side of the condensate groove is communicated with a liquid-separation corner hole. The multistage liquid-separation plate-type condenser has the advantages that lowering of condensation heat transferring thermal resistance can be favored; condensation heat transferring of the steam is maintained under high dryness, a high coefficient of heat transfer is maintained, and thus the purpose of intensification of condensation heat transfer can be achieved; the multistage liquid-separation plate-type condenser is guaranteed to work in an optimum liquid-separation working condition, and thus the effect of liquid-separation condensation of the hear transfer can be guaranteed; meanwhile, the structure is simple, processing cost is lowered, and the advantages that a compact structure of a traditional plate-type heat transfer is maintained, and the economical efficiency is good are maintained.

The invention relates to a solar sea water desalinating device which comprises a medium and high temperature solar heat collecting and storing device, a heat exchanging device and a condensation heat transfer device, wherein the medium and high temperature solar heat collecting and storing device is connected with the heat exchanging device, and the heat exchanging device is connected with the condensation heat transfer device by a heat transfer tube. The technology provided by the invention provides the solar sea water desalinating device which carries out desalination of sea water by a combined mode of energy accumulation and photo-thermal conversion, has high solar heat utilization ratio, high water yield, novel structure and low cost, and can operate in all weather.

There is a sort of heat transfer method of condensation aggrandizement type which mixes the steam, and it belongs to the area of aggrandizement heat transfer and energy-saving technique. It relates concretely to the modified character or the dispose course, and it applies to the set which has incondensable gas or the condensation-heat exchange set which mixes the steam in order to realize the aggrandizement of the condensation-heat exchange character. By changing the flowing form of the condensation liquid and the reciprocity between the dynamic and the boundary layer of the gas phase it makes the condensate which is in the groovy reliable membranous flow method to shell in the form of big dripping, the dripping can slide in the surface or shell along the boundary layer of the gas phase, it decreases the thermal resistance of the film of the condensate, at the same time for the intrusive action of the shell of the dripping, it is propitious to decrease the boundary layer of the heat transfer and the matter transfer, and it consolidates the whole heat transfer character of condensation aggrandizement type which mixes the steam. This invention can be used in the condenser which mixes the industrial material or has the incondensable gas. Its effect and benefit is that: in this instance that not using any additive power consumption, it only use the autologous gravitational effect of the condensate, and it makes the mixed steam heat transfer character of the mixed steam to obtain obvious melioration.