710 results about "Convective flow" patented technology

The present invention relates to a monolithic biomaterial. The monolithic biomaterial has a primary network of convective flow, microfluidic channels that are embedded in a substrate, where the substrate is diffusively permeable to aqueous solutes. The present invention also relates to a method of making the monolithic biomaterial, as well as methods of using the monolithic biomaterial to facilitate healing of a cutaneous wound of a mammalian subject and of regulating cells.

A solid state lamp with efficient heat sink arrangement. To provide adequate cooling utilizing a defined form factor, such as that of the A-lamp incandescent bulb, the interior volume is used more efficiently. As one example, a solid state lamp employs a heat sink with inward facing fins. Solid state light sources, such as light emitting diodes (LEDs), are mounted on the exterior of the heat sink. An air path for convective flow is established through the center of the lamp.

An airfoil insert comprises an insert wall, a contact element and a flow director. The insert wall defines an interior extending inside the insert wall from a first end to second end, and an exterior extending outside the insert wall from the first end to the second end. The contact element is formed on the exterior of the insert wall. The flow director is formed on the insert wall at a boundary between the interior and the exterior. The flow director increases a heat transfer coefficient of convective flow along the insert wall by directing the convective flow to the exterior of the insert wall.

A dual air cavity roof has a continuous upper cavity which is cooled by fans, while the lower cavity is generally sealed. Preferably the cavities are separated by a radiant barrier. The fans are preferably powered by one or more photovoltaic cells that are also disposed on the roof. The roof can be pre-cooled with cooler night air and fans only activated when necessary to remove heat from the solar load on the upper cavity. When it is desirable to remove heat, the fan speed is optimized in each zone of the roof to enhance the natural convective flow to the optimum level. A radiant barrier can also cover the roof substrate, which is optionally an existing roof that is in need of repair. The roof structure is preferably assembled in parallel modules using insulating support brackets that support the outer surface and the barrier that separates the upper and lower cavity.

A method and system for increasing the flow resistance of pathways in the lung by employing aspiration to establish an artificial convective flow current between compartments in the lung in order to entrain and deliver a clogging agent preferentially to the pathways. This treatment is performed after an area has been properly diagnosed for treatment.

A membrane-type water-cooled wall four-flue biomass circulating fluidized bed boiler, including a drum, a furnace, a cyclone separator, a feeder, a second flue, a third flue, a fourth flue, an economizer, and a dust collector Devices, induced draft fans, chimneys. Among them, the furnace, the second flue and the third flue are surrounded by membrane water-cooled walls; Refractory castables are laid around the joints of the ducts; a medium-temperature panel superheater is arranged at the upper end of the second flue, and high-temperature and low-temperature convective superheaters are arranged at intervals in the third flue, and the tundish wall adopts a tapered wall structure; low-temperature convective superheating The first water spray desuperheater and the second water spray desuperheater are respectively arranged between the high temperature convective superheater and the medium temperature panel convective superheater. The invention improves the utilization rate of combustion heat energy of the biomass fluidized bed boiler, reduces the abrasion of the inner wall of the flue and the corrosion of the alkali metal by the high-speed and high-temperature flue gas, and enhances the wear resistance of the wall surface.

A cooking oven controlled by an included retail-grade control device having a capacitive glass touchscreen and running a specialized cooking and controlling app, such as an Android tablet. A cooling system for the oven provides a reverse air flow cooling system that pulls air in from the top front of the oven rather than pushing it out. A single cooling fan provides adequate cooling to the control device, as well as providing cooling to a front door of the oven and also convective flow through the heating chamber. The control device is mounted in an upper control bezel which has a series of lateral air intake openings on a rear wall. The cooling fan actively cools the control device by pulling air into the intake openings and through a lower exhaust opening.

The present invention involves a method and apparatus for enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the heavy oil and bitumen in situ by a downhole electric heater. Multiple propped vertical hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a diluent. The heater and downhole pump force thermal convective flow of the heated diluent to flow upward and outward into the propped fractures and circulating back down and back towards the well bore heating the oil sands and in situ bitumen on the vertical faces of the propped fractures. The diluent now mixed with produced products from the oil sand re-enters the bottom of the well bore and passes over the heater element and is reheated to continue to flow in the convective cell. Thus the heating and diluting of the in place bitumen occurs predominantly circumferentially, i.e. orthogonal to the propped fracture, by diffusion from the propped vertical fracture faces progressing at a nearly uniform rate into the oil sand deposit. In situ hydrogenation and thermal cracking of the in place bitumen can provide a higher grade produced product. The heated low viscosity oil is produced through the well bore at the completion of the active heating phase of the process.

The present invention involves a method and apparatus for enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the heavy oil and bitumen in situ by a downhole electric heater. Multiple propped vertical hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a diluent. The heater and downhole pump force thermal convective flow of the heated diluent to flow upward and outward into the propped fractures and circulating back down and back towards the well bore heating the oil sands and in situ bitumen on the vertical faces of the propped fractures. The diluent now mixed with produced products from the oil sand re-enters the bottom of the well bore and passes over the heater element and is reheated to continue to flow in the convective cell. Thus the heating and diluting of the in place bitumen occurs predominantly circumferentially, i.e. orthogonal to the propped fracture, by diffusion from the propped vertical fracture faces progressing at a nearly uniform rate into the oil sand deposit. In situ hydrogenation and thermal cracking of the in place bitumen can provide a higher grade produced product. The heated low viscosity oil is produced through the well bore at the completion of the active heating phase of the process.

An improved method and apparatus are provided for cleaning the specimen and interior specimen chamber of Electron Microscopes, and similar electron beam instruments. The apparatus consists of a UV source oxygen-radical generator placed on a specimen chamber port or inside the specimen chamber under vacuum. Air or other oxygen and nitrogen mixture is admitted to the generator at a pressure below 1 Torr. The UV source radiates UV wavelengths below 190 nm that are used to disassociate oxygen to create the oxygen radicals. The oxygen radicals then disperse by convective flow throughout the chamber to clean hydrocarbons from the surfaces of the chamber, stage and specimen by oxidation to volatile oxide gases. The oxide gases are then removed by the convective flow to the vacuum pump.

In particular it is a novel method and apparatus for cleaning the specimen chamber, specimen stage, and specimen inside the vacuum system of these instruments with oxygen radicals produced from air or other oxygen containing gas by photo-dissociation by passing said gas by a UV source with wavelengths that can produce oxygen radicals. The oxygen radicals are used to oxidize the hydrocarbons and convert them to easily pumped gases. The method and apparatus can be added to the analytical instrument and other vacuum chambers with no change to its analytical purpose or design.

A process for forming room temperature water soluble polymer coatings on porous substrates by forming a solution of a room temperature water soluble polymer, one or more crosslinkers, a solvent for the room temperature water soluble polymer such as water and optionally one or more porogens, or functional agents, stirring the mixture until all the components are dissolved, adding the solution to a porous structure such as a non-woven fabric or a porous membrane and drying the solution on to the substrate as a coating before subjecting the coating to crosslinking. Alternatively, the coating may be partially crosslinked before drying the solution. Porous structures having a room temperature water soluble polymer coating and being capable of convective flow through the pores of the structure and diffusive flow through the coating can be formed.

Water flow field inlet manifolds (33, 37) are disposed at the fuel cell stack (11) base. Water flow field outlet manifolds (34, 38) are located at the fuel cell stack top. Outlet and inlet manifolds are interconnected (41-43, 47, 49, 50) so gas bubbles leaking through the porous water transport plate cause flow by natural convection, with no mechanical water pump. Variation in water level within a standpipe (58) controls (56, 60, 62, 63) the temperature or flow of coolant. In another embodiment, the water is not circulated, but gas and excess water are vented from the water outlet manifolds. Water channels (70) may be vertical. A hydrophobic region (80) provides gas leakage to ensure bubble pumping of water. An external heat exchanger (77) maximizes water density differential for convective flow.

Two main embodiments of a heat shield for a barbecue grill are disclosed herein. Both are designed to reduce the transfer of heat from the heated volume of the cooking chamber to the handle of the barbecue grill. The first embodiment mounts to the exterior of the cooking chamber and is disposed between the cooking chamber and the handle. The first embodiment is contoured to interrupt the convective flow of heated air away from the handle. The second embodiment mounts to the interior of the cooking chamber opposite the handle. The second embodiment rests adjacent the inside surface of the cooking chamber to form a partially or substantially closed volume that serves as an insulating barrier for the handle.

An LED bulb includes a base, a shell connected to the base, and a thermally conducting liquid held within the shell. The LED bulb has a plurality of finger-shaped projections, disposed within the shell. The finger-shaped projections are separated by a plurality of channels formed between pairs of the plurality of finger-shaped projections for holding a plurality of LEDs. The plurality of finger-shaped projections and the plurality of channels are configured to facilitate a passive convective flow of the thermally conductive liquid through the plurality of channels, when the LED bulb is oriented in at least three different orientations. In a first orientation, the shell is disposed vertically above the base. In a second orientation, the shell is disposed on the same horizontal plane as the base. In a third orientation, the shell is disposed vertically below the base.

A wellbore completion design is provided, which creates a convective flow action that separates water and sand from hydrocarbons during production of the hydrocarbons from a subterranean formation. A deviated section of the wellbore creates the desired effect. The wellbore completion design may include a secondary bore, which intersects the deviated section of the wellbore at an acute angle, to accumulate the separated water and sand. An injection pump disposed in the toe section of the secondary bore can also be employed to pump the water back into the water containing portion of the subterranean formation. If solids are present in more than trace amounts, the toe section of the secondary bore may be formed at an acute angle to the remaining portion of the secondary bore to prevent blockage of the pump. Alternatively, a tertiary bore may be provided, so that the solids can accumulate in the secondary bore and the water can flow into the tertiary bore.

The invention provides a process and a device for movably adsorbing poisonous and harmful substances in natural water areas. The movable adsorption process comprises that: when a river is polluted by poisonous and harmful substances and needs to be treated, firstly, the polluted water area is isolated from the unpolluted water area; and secondly, the adsorbing materials capable of adsorbing poisonous and harmful substances are dragged to move in the water body of the polluted water area for movable adsorption, so that the aim of quickly purifying water is achieved. The movable adsorption device comprises a movable adsorption unit module consisting of a bracket, adsorbing materials and floaters, wherein the adsorbing materials are put in meshed bags which are staggered and hanged on the bracket, and the bracket is connected with the floaters. The process and the device have the advantages that the concentration diffusion adsorbing path is short; the movement of the movable adsorption device improves the convective diffusion efficiency and further enhances the adsorption mass transfer effect, so that the contents of the poisonous and harmful substances in the water body can be effectively reduced in a short period of time.

A method for transferring heat includes flowing a wastewater through a tank and flowing a fluid through a heat exchanger having an outer surface. The method further includes aerating the wastewater to produce a convective flow, contacting the outer surface of the heat exchanger with the convective flow to exchange heat, and cleaning the outer surface of the heat exchanger with the convective flow. A system for transferring heat includes a tank, a heat exchanger with an outer surface disposed in the tank, and a fluid flowing through the heat exchanger. Wastewater located in the tank flows over the outer surface of the heat exchanger, and a diffusion pipe disposed in the tank provides air into the tank to produce a convective flow in the wastewater.