垂直二重管内の速度助走区間の熱伝達

概要

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For the purpose of simple calculations by the Theory of Boundary Layer, the author performed the calculations of heat transfer of the case in which free convection and laminar flow coexist at the same time in the velocity entry length (entrance region) of the vertical double pipes with annular space (annulus) heated from the inner pipe. When the pipe wall temperatures are constant as usual, the treatments in the cases of laminar flow only and free convection only are comparatively easy. But, actually, there are many cases in which the pipe wall temperatures vary along the direction of the pipe axis, and free convection and forced 1aminar f1ow coexist at the same time. The author induced certain theoretical formulas for this case by the Theory of Boundary layer and the simple treatments as far as possible. The main points different from the usual methods in this thesis are : (1) The temperature distribution and the velocity distribution are shown by the Besse1 Functions, (2) f_0 (z), the temperature distribution of the inner pipe wall is taken into consideration, and (3) Gauss' method of numerical integration is used. In the numerical calculations, we are able to avail Tables of Bessel Functions and Gauss' method with high accuracy and therefore it is very convenient in these respects. It has been revealed that the theoretical results coincide with the experimental results very well.
一般社団法人日本機械学会の論文
1960-08-25