二重管内の助走区間の熱伝達

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  • Heat Transfer in Entry Length of Double Pipes
  • ニジュウ カンナイ ノ ジョソウ クカン ノ ネツ デンタツ

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In the industrial heat exchangers, there are many cases where heat transfer begins instantly at the entrances of Double Pipes and the temperature distributes over the walls of Double Pipes, and therefore, Research of Heat Transfer of Double Pipes in hydrodynamic entry length and in thermal entry length is necessary, but there is few. In this case, theoretical and experimental researches of laminar heat transfer of double pipes in hydrodynamic entry length and in thermal entry length are performed. It is described that theoretical solutions coincide with experiments very well. In the theoretical solutions, nonlinear Volterra's integral equation and Gauss' method with a high accuracy, in the method of numerical integration, are used. Moreover, theoretical calculations of length of hydrodynamic entry region and thermal entry region of double pipes, are described.

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