Showing papers on "Fin (extended surface) published in 1968"
TL;DR: In this article, a theoretical analysis of conduction through and free convection from a tapered, downward-projecting fin immersed in an isothermal quiescent fluid is presented.
Abstract: A theoretical analysis of conduction through and free convection from a tapered, downward-projecting fin immersed in an isothermal quiescent fluid is presented. The problem is solved by assuming quasi-one-dimensional heat conduction in the fin and matching the solution to that of the convection system, which is treated as a boundary layer problem. For an infinite Prandtl number, solutions are derived which take the form of a power law temperature distribution along the fin. The effect of this power (n) on heat transfer, drag, and the corresponding boundary layer profiles is discussed. It is shown that n is independent of the fin profile and dependent on a single nondimensional group χ. The theoretical results for infinite Prandtl number are compared with corresponding results derived from previous work using a Prandtl number of unity. The effect of Prandtl number on the determination of n and consequently the fin effectiveness is found to be extremely small. The results of an experimental program are also presented. These consist of temperature profiles and the n — χ relation for different fin geometries and surrounding fluids. Comparison with the theoretical predictions reveals good agreement.
28 citations
TL;DR: In this article, the authors delineated important heat transfer mechanisms and determined the dependence of heat transfer on fuel vapour properties, and showed that fuel consumption rates, for the diameter range of interest, are determined primarily by nonradiative rather than radiative heat transfer.
21 citations
9 citations
Patent•
29 Jul 1968TL;DR: In this paper, a heat transfer device including a tubular shell and a corrugated fin member was inserted within the shell, in which the cooling fluid flows axially through a plurality of passages formed by the fin member.
Abstract: A heat transfer device including a tubular shell and a corrugated fin member inserted within the shell in which the cooling fluid flows axially through a plurality of passages formed by the corrugated fin member and the fluid to be cooled flows through a tortuous series of passages formed by the corrugated fin member.
8 citations
01 Feb 1968
TL;DR: Weight, heat transfer, and efficiency comparison for Rankine cycle space radiators constructed of three different finned tube geometries are presented in this paper, where the authors compare the performance of the three different tube geometry.
Abstract: Weight, heat transfer, and efficiency comparison for Rankine cycle space radiators constructed of three different finned tube geometries
6 citations
TL;DR: In this paper, a variational problem on the determination of an optimum-weight radiator-fin profile is formulated so as to result in a uniquely defined solution, and the results of the computer-derived solution are presented here.
Abstract: A variational problem on the determination of an optimum-weight radiator-fin profile is formulated so as to result in a uniquely defined solution. The results of the computer-derived solution are presented here. The effect of certain structural factors on the weight of the radiator fin is analyzed.
2 citations
TL;DR: In this paper, the authors describe a theoretical investigation of heat transfer in stratified horizontal slab and spherical shell containing temperature dependent heat sources, which can find applications in defining the local and global temperature distributions in the earth's crust.
Abstract: The paper describes a theoretical investigation of heat transfer in stratified horizontal slab and spherical shell containing temperature dependent heat sources. The desired expressions of temperatures contain only ordinary functions suitable for high speed computation. The results can find applications in defining the local and global temperature distributions in the earth's crust.
2 citations
01 Jan 1968
TL;DR: Preliminary design for vapor and conduction fin radiators for Brayton cycle space powerplant is presented in this article, which is based on the same idea as our work.
Abstract: Preliminary design for vapor and conduction fin radiators for Brayton cycle space powerplant
TL;DR: In this paper, the authors considered the variational problem of defining the form of a narrow fin of least cross-sectional area for the convection dissipation of a given heat flux and analyzed the effect of certain parameters on the optimum shape of the fin.
Abstract: We consider the solution of the variational problem of defining the form of a narrow fin of least cross-sectional area for the convection dissipation of a given heat flux. The effect of certain parameters on the optimum shape of the fin is analyzed.
TL;DR: In this paper, approximate solutions for the transfer of heat in two regions, i.e., a region in which the inertial and viscous forces are of identical order of magnitude, and the region of creep flow, are presented.
Abstract: Approximate solutions are presented for the transfer of heat in two regions, i. e., a region in which the inertial and viscous forces are of identical order of magnitude, and the region of creep flow. The experiments carried out with air over a wide range of Rax numbers yield results in good agreement with the solutions.
TL;DR: In this article, the relative instead of the absolute quantities characterizing a process are determined, based on the fact that more approximate models can be used if the relative model can be determined.
Abstract: The proposed method of analyzing physical phenomena is based on the fact that more approximate models can be used if the relative instead of the absolute quantities characterizing a process are determined. The method is exemplified in the solution of a number of thermophysical problems concerned with the effect of injection and suction on heat transfer in a gas stream, the relation between critical heat load and contact angle, etc.
TL;DR: A nonstationary method of investigating heat transfer during boiling on a flat surface is described in this paper, where the heat flux is determined from the reduction in the intrinsic energy of a massive bar over a definite time interval by graphic integration of the temperature field over the bar length.
Abstract: A nonstationary method of investigating heat transfer during boiling on a flat surface is described. The heat flux is determined from the reduction in the intrinsic energy of a massive bar over a definite time interval by graphic integration of the temperature field over the bar length.