Showing papers on "Fin (extended surface) published in 1973"
TL;DR: In this article, a modified packet model for heat transfer between a gas-fluidized bed and an immersed surface is presented, and the model readily explains the effect of particle moisture content, shape of the immersed body and other factors on bed to immersed body heat transfer.
196 citations
TL;DR: In this article, an analysis of the ultimate limit of heat transfer of cylindrical heat pipes with laminar vapour flow is presented for the two limiting cases of either predominant inertia- or viscous forces (inertia and viscous flow regime), taking into consideration both the axial and radial variation of the vapour velocity.
125 citations
01 Jan 1973
118 citations
TL;DR: In this paper, the heat transport and vertical component of the fluid velocity in a horizontal layer of water heated from below were measured and the heat transfer results were well correlated by a simple power law relationship and indicated the possibility of flow transitions even at relatively high Rayleigh numbers.
Abstract: Measurements were taken of the heat transport and vertical component of the fluid velocity in a horizontal layer of water heated from below. The heat transfer results were well correlated by a simple power law relationship and indicated the possibility of flow transitions even at relatively high Rayleigh numbers. The velocity measurements were obtained optically and compared to predictions of Kraichnan.
108 citations
TL;DR: In this paper, the authors examined liquid immersion techniques for cooling minute heat sources and found that nucleate boiling may introduce mechanical stresses, contamination and physical design problems, and two alternatives to boiling (forced convection and bubble induced mixing) were also investigated which reduced or bypassed some of these problems.
47 citations
01 Feb 1973
16 citations
TL;DR: In this article, a numerical solution of the dimensionless continuity, momentum, heat and reactant mass balance equations was carried out using a finite difference technique and the principal assumptions under which solution was obtained were: compressible natural convection, a first order reaction and a constant wall temperature equal to the inlet temperature of the fluid.
14 citations
Patent•
01 Feb 1973
TL;DR: A deckle structure for an extrusion die including a cooling supply tube having a fin projecting therefrom and in heat transfer relation is described in this article, where the fin projects into the outlet slot of the die upon the distribution of cooling fluid through the supply tube, the fin is cooled thereby reducing the temperature of the plastic in contact therewith.
Abstract: A deckle structure for an extrusion die including a cooling supply tube having a fin projecting therefrom and in heat transfer relation therewith The fin projects into the outlet slot of the die Upon the distribution of cooling fluid through the supply tube, the fin is cooled thereby reducing the temperature of the plastic in contact therewith The cooling of the plastic increases the viscosity of the plastic which in cooperation with the fin seals the blocked portion of the outlet slot
14 citations
13 citations
Patent•
14 Feb 1973
TL;DR: In this paper, a power burner, fin tube heat exchanger includes a plurality of parallel fin tubes connected at each end with a manifold to define a combustion chamber or enclosure, and a gas and air mixture is provided to the enclosure by a blower and ignited.
Abstract: A power burner, fin tube heat exchanger includes a plurality of parallel fin tubes connected at each end with a manifold to define a combustion chamber or enclosure. A gas and air mixture is provided to the enclosure by a blower and ignited. A flue gas collector enshrouds the fin tube enclosure and provides an exhaust path for the combusted flue products.
12 citations
TL;DR: In this paper, the authors considered the problem of heat transfer to a finite wedge-shaped fin in a laminar flow, where the energy equations for the fluid and the solid body were solved simultaneously under the conditions of continuity in heat flux and temperature at the interface.
Patent•
17 Apr 1973TL;DR: A true counterflow heat exchanger of the tube and fin type having a cartridge design in accordance with which the heat exchange unit may be removably installed in a housing cavity while retaining its counterflow principle of operation is described in this paper.
Abstract: A true counterflow heat exchanger of the tube and fin type having a cartridge design in accordance with which the heat exchanger unit may be removably installed in a housing cavity while retaining its counterflow principle of operation. A manifold member at an inner end of the unit is formed for free flow of a first fluid therethrough and for confined flow of a second fluid to receive such second fluid and return it to the opposite or outer end of the unit.
01 Jan 1973
TL;DR: In this paper, a comparison between temperature drops in cylindrical and spherical shells and in slabs in the cases of uniform and non-uniform internal heat generation with the same total amount of heat is made.
Patent•
22 Jun 1973
TL;DR: In this article, a concentric double-pipe fluid heat exchange element for horizontal orientation is provided with support for the central pipe consisting of at least one support fin secured to the central manifold and extending into contact with the outer manifold.
Abstract: A concentric double-pipe fluid heat exchange element for horizontal orientation is provided with support for the central pipe consisting of at least one support fin secured to the central pipe and extending into contact with the outer pipe. The support fin is at least coextensive with the flow path of the fluid in the annulus between the pipes. The heat exchanger is intended to operate on fiber-containing fluids.
TL;DR: In this article, the effect of streamwise heat conduction on heat transfer from a flat plate is studied at low Prandtl numbers, where the surface temperature of the plate is assumed to vary according to a power law with respect to the power of the convexity.
Abstract: The effect of streamwise heat conduction on heat transfer from a flat plate is studied at low Prandtl numbers. The surface temperature of the plate is assumed to vary according to a power law with ...
TL;DR: In this paper, the velocity and heat transfer fields near a vertical permeable surface with simultaneous convection were investigated and a solution was found for the boundary layer equations with known laws of surface temperature and flow velocity change.
Abstract: The velocity and heat transfer fields near a vertical permeable surface with simultaneous convection are investigated. A solution is found for the boundary layer equations with known laws of surface temperature and flow velocity change. The transformed boundary layer equations contain the parameter G/R2, which determines the effect of free convection on friction and heat transfer for constrained motion. Calculations of friction and heat transfer as functions of draft (suction) with simultaneous convection are presented.
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TL;DR: In this article, a 15,000 watt spacecraft waste heat rejection system utilizing heat pipe radiator panels was investigated, and a nominal 500 watt radiator panel was designed, built and tested.
Abstract: A 15,000 watt spacecraft waste heat rejection system utilizing heat pipe radiator panels was investigated. Of the several concepts initially identified, a series system was selected for more in-depth analysis. As a demonstration of system feasibility, a nominal 500 watt radiator panel was designed, built and tested. The panel, which is a module of the 15,000 watt system, consists of a variable conductance heat pipe (VCHP) header, and six isothermalizer heat pipes attached to a radiating fin. The thermal load to the VCHP is supplied by a Freon-21 liquid loop via an integral heat exchanger. Descriptions of the results of the system studies and details of the radiator design are included along with the test results for both the heat pipe components and the assembled radiator panel. These results support the feasibility of using heat pipes in a spacecraft waste heat rejection system.