AN IMPROVED CORRELATION FOR HEAT TRANSFER COEFFICIENT OF TWO-PHASE FLOW IN A VERTICAL TUBE

Altinisik, Kemal; Mat, Mahmut D.; Aldas, Kemal; Kaplan , Yuksel; Karakoc , Feridun

Energy and the Environment, 1998

ISBN Imprimir: 1-56700-127-0

AN IMPROVED CORRELATION FOR HEAT TRANSFER COEFFICIENT OF TWO-PHASE FLOW IN A VERTICAL TUBE

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Kemal Altinisik Mechanical Engineering Department, Nigde University, Nigde, Turkey

Mahmut D. Mat Mechanical Engineering Department, Nigde University, Nigde, Turkey

Kemal Aldas Mechanical Engineering Department, Nigde University, Nigde, Turkey

Yuksel Kaplan Mechanical Engineering Department, Nigde University, Nigde, Turkey

Feridun Karakoc Mechanical Engineering Department, Nigde University, Nigde, Turkey

Resumo

A correlation is developed using Lockhard-Martinelli parameters for predicting the heat transfer coefficient during the two phase flow of water-vapor system. An upward flow in a vertical circular pipe at atmospheric conditions is considered. The constants in the correlation have been obtained after 2800 measurements. The accuracy of correlation is found to be 96.5 using t test. ΔT-h_tp and h_tp variations are also investigated using measured data.

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