156results about How to "Increase capillary force" patented technology

A disposable urea sensor has a laminated body having a fluid sample inlet end and an electrical contact end, a fluid sample inlet, a substantially flat sample chamber in communication between the fluid sample inlet and a vent opening, the sample chamber being adapted to collect a fluid sample through the fluid sample inlet, a working electrode and a reference electrode within the sample chamber, and a reagent matrix disposed on the working electrode wherein the reagent matrix contains urease.

The invention provides compound copper powder for manufacturing a capillary structure inside a heat pipe, which is a mixture consisting of copper powder and pore-forming agent powder. The compound copper powder ensures that a more favorable capillary structure layer can be produced under the condition of not changing the conventional heat pipe manufacturing process. The compound copper powder obtained by the invention is ram-jolted and sintered and then is prepared into the capillary structure layer with high porosity; and the effective porosity and the through hole ratio thereof are greatly improved compared with that of ordinary copper powder, and the permeability is also greatly improved compared with that of materials fired by the ordinary copper powder, which greatly improves the heat transfer efficiency of the heat pipe.

A system and method for correcting the oxygen effect on oxidase-based analyte sensors includes an oxygen sensor with a working electrode, a reagent matrix disposed on at least the working electrode that contains a reduced form of a redox mediator, an oxidase and a peroxidase, an oxidase-based analyte sensor, a means for determining the oxygen concentration in a portion of a fluid sample using the oxygen sensor, means for determining an analyte concentration in another portion of the fluid sample using the oxidase-based analyte sensor, and means for using the oxygen concentration in the fluid sample to determine a corrected analyte concentration in the fluid sample.

Nozzle arrangement (10) of a vacuum cleaning device (100) for cleaning a surface (20), comprising: —a nozzle housing (28); —a brush (12) rotatable about a brush axis (14), said brush (12) being provided with flexible microfiber brush elements (16) having tip portions (18) for contacting the surface to be cleaned (20) and picking up dirt and liquid particles (22, 24) from the surface to be cleaned (20) during the rotation of the brush (12); —a drive means for rotating the brush (12); —a single squeegee element (32) for wiping dirt and liquid particles (22, 24) across or off the surface to be cleaned (20) by contacting said surface (20) with its free end (33), wherein said squeegee element (32) extends along a longitudinal direction (48), which is arranged substantially parallel to the brush axis (14), and is attached with its fixed end (33) to the bottom side (30) of the nozzle housing (28) on a side of the brush (12) where the brush elements (16) enter the nozzle housing (28) during the rotation of the brush (12).

A heat-transporting device includes a working fluid, a vessel, a vapor-phase flow path, and a liquid-phase flow path. The working fluid transports heat using a phase change. The vessel seals in the working fluid. The vapor-phase flow path causes the working fluid in a vapor phase to circulate inside the vessel. The liquid-phase flow path includes a laminated body and causes the working fluid in a liquid phase to circulate inside the vessel, the laminated body including a first mesh member and a second mesh member and being formed such that the first mesh member and the second mesh member are laminated while weaving directions thereof differ relatively.

The invention discloses a flat heat radiating pipe which comprises a pipe cavity with two closed ends and a pipe wall enclosing the pipe cavity along the axial direction, wherein the pipe wall comprises arc walls positioned at two sides and a flat wall for connecting the arc walls, the pipe cavity and the pipe wall are sequentially defined as an evaporation section, a heat insulation section and a condensation section along the axial direction; the pipe cavity is internally provided with a main capillary structure and an auxiliary capillary structure, wherein the main capillary structure is in contact with the flat wall of the evaporation section or in contact with the flat walls of the evaporation section and the heat insulation section; the auxiliary capillary structure is in contact with the arc wall positioned at least one side, the pipe cavity between the main capillary structure and the auxiliary capillary structure is filled with a working medium; and a main gas channel of a heat radiating pipe has enough space so that capillary force of the flat heat radiating pipe is improved and conveying capacity of the working medium is increased, and thus heat transfer efficiency of the flat heat radiating pipe is increased. The invention also provides a manufacturing method of the flat heat radiating pipe.

The invention proposes a new type of flat heat soaking pipe and discloses its laser preparation method, which includes an upper plate, a lower plate and liquid injection and air extraction pipes, all components are made of copper material, the lower plate of the flat heat pipe is the evaporation section, the upper plate It is the condensation section and the middle section is the heat insulation section. The inner wall of the upper and lower plates is processed with a groove structure. The groove structure is processed into a grooved composite pin-fin structure by laser according to the working principle of the heat pipe. Laser etching can be sequentially processed on the surface of the copper plate to obtain different Characteristic complex shape microstructures. The invention can improve the boiling performance of the evaporating section and the start-up performance of the heat pipe, and the steam cooling performance of the condensing section. The pin-fin structure can not only strengthen the strength of the heat pipe and reduce the interface shear force, but also facilitate the rapid reflux and dripping of the condensate on the upper plate to the lower plate. A cycle is formed to improve the heat transfer performance of the heat pipe.

A diagnostic and analytical apparatus including the microfluidic device having: an inlet portion with a first cross-section, a flow delaying portion with a second cross-section that is larger than the cross-section of the inlet portion thereby reducing the interfacial curvature of the microfluid entering from the inlet portion by capillary force and the flow rate of the microfluid, and a flow recovery portion having a third cross-section that is smaller than the cross-section of the flow delaying portion. The flow of a very small volume of fluid can be quantitatively regulated through a channel having a particular design that can induce spontaneous flow by capillary force without additional manipulation processes and energy requirement.

A flat plate type heat spreading device is provided. The flat plat type heat spreading device can reduce heat by generating phase transition of liquid by using heat of a heat source so as to solve various problems caused by heat generated in components of electronic devices such as personal computers or mobile phones. Specifically, the flat plate type heat spreading device includes a lower plate for evaporating liquid, a middle plate combined with an upper surface of the lower plate, which separately includes a path through which evaporated vapor passes and a path through which condensed fluid flows into the lower plate, and an upper plate combined with an upper surface of the middle plate, which condenses the evaporated vapor.

A heat spreader (10) and a method for manufacturing the heat spreader are disclosed. The heat spreader includes a metal casing (12) and a wick structure (16) lines an inner surface of the metal casing. The metal casing defines therein a chamber (14) and includes an evaporating section (126) and a condensing section (127). The wick structure is in the form of metal foam and occupies a portion of the chamber. In one embodiment, the wick structure has a pore size gradually increasing from the evaporating section towards the condensing section of the metal casing. The heat spreader is manufactured by electrodepositing a layer of metal coating (70) on an outer surface of a metal foam framework (20). The metal coating becomes the metal casing and the metal foam framework becomes the wick structure.

The invention provides a variable-parameter liquid absorption core ultrathin heat pipe. Small-bore and high-porosity structures (201) are adopted in the areas on the two sides, in the width direction, of a liquid absorption core (2). A large-bore and small-porosity structure (202) is adopted in the area in the middle, in the width direction, of the liquid absorption core (2). According to the small-bore and high-porosity structures (201) of the areas on the two sides of the liquid absorption core (2), when the heat pipe works, a gas-liquid interface area in the liquid absorption core can be enlarged, the flow of working media participating in the evaporation and condensation process is increased, and the capillary drive force of the area is improved; meanwhile, by means of the large-bore and small-porosity structure of the area in the middle, the amount of working medium liquid stored in the liquid absorption core is increased, the resistance for the working media flowing to the two sides of the liquid absorption core is lowered, and working medium liquid can be supplemented to the areas on the two sides more easily; and the circulating speed of gas-liquid working media is increased, and efficient running of the ultrathin heat pipe is achieved.

The present invention relates to a cleaning device for cleaning a surface, with a nozzle arrangement (10) comprising: —a brush (12) rotatable about a brush axis (14), said brush (12) being provided with brush elements (16) having tip portions (18) for contacting the surface to be cleaned (20) and picking up dirt particles (22) and/or liquid (24) from the surface (20) during the rotation of the brush (12), —a drive means for driving the brush (12) in rotation, —a bouncing element (32) comprising a bouncing surface (33) that is configured to let the dirt particles (22) and/or liquid (24), that are released from the brush (12) during rotation, rebound to the brush (12), said bouncing surface (33) being spaced apart from the brush (12) and extending substantially parallel to the brush axis (14), and —an adjustment means (35) for adjusting the position of the bouncing element (32) relative to the surface (20) depending on a direction of movement (40) of the device, wherein the adjustment means (35) is adapted to arrange the bouncing element (32) in a first position in which the bouncing element (32) has a first distance d1 to the surface (20), when the cleaning device is moved in a forward direction, in which the bouncing element (32) is, seen in the direction of movement of the device (40), located behind the brush (12), and to arrange the bouncing element (32) in a second position in which the bouncing element (32) has a second distance d2 to the surface, when the cleaning device is moved in an opposite backward direction, wherein d2 is greater than d1 and equal to d3*tan(α), d3 being the distance between the bouncing surface (33) and the position of the brush (12) where the tip portions (18) lose contact from the surface to be cleaned (20) during the rotation of the brush (12), and α being an angle that is equal to or smaller than 20°.

The invention relates to a hypersonic aircraft dredging-type rudderpost heat protection structure. The rudderpost is designed as a hollow structure, the upper surface of the hollow cavity is positioned above the rudderpost mounting gap and is isolated from the control surface through a heat-insulation layer, and the lower surface is positioned inside the aircraft body and is isolated from the control actuator through a phase-change material or heat sink. The side wall of the hollow cavity is provided with a channel which is parallel to the rudderpost bus, a capillary core is welded with the surface of the channel, the hollow cavity is filled with a working medium, and the heat quantity of aerodynamic heating at the rudderpost gap is dredged to the inner wall of the whole hollow cavity through the phase change and dispersion of the working medium in the hollow cavity. The part of the rudderpost inside the aircraft body and the external surface of the control surface part are respectively provided with a heat-insulation layer.

Disclosed are a dry bonding system and a wearable device for skin bonding including the dry bonding system.

The invention provides a through hole metal foam heat pipe heat exchange device with gradient topographic characteristics and relates to the technical field of rigid heat conductors. The through hole metal foam heat pipe heat exchange device with gradient topographic characteristics comprises a heat pipe and through hole metal foams sintered on the inner wall of the heat pipe. A heat insulation section is arranged on the outer layer in the middle of the heat pipe, and two ends are respectively arranged at the cold end and the hot end of heat exchange environment. The structure of the through hole metal foams is that inner through holes are structures with gradient density, namely porosity factor is the same, and hole density is increased or reduced gradually along the perpendicular direction of the wall surface of the heat pipe; or hole density is the same, and the porosity factor is increased or reduced gradually along the perpendicular direction of the wall surface of the heat pipe; the hole density and the porosity factor are the same, and used materials are changed according to layers. The through hole metal foam heat pipe heat exchange device with gradient topographic characteristics increases heat exchange surface area, facilitates flow and heat exchange of fluid expanded gradually because of being heated, enhances capillary force, and enables the heat pipe to have high heat exchange efficiency under the condition of same heat exchange effect. Metal consumption is small, and volume is small.

This invention discloses a radiating device, which can be a uniform heat cavity combined with any heating components. The device includes a closed cavity and a capillary structure formed on the inside wall of said cavity, in which, said capillary structure includes multiple grooves formed on the inside wall of the cavity and porous powder sintered under high temperature on the inside wall , thus the radiating device has good capillary force of sintered capillary structure and penetrability of groove structure to speed up the radiation backflow of the working liquid and increase the radiation efficiency of the device.