Abstract
There is a belief that the generally accepted Dittos and Boelter heat transfer equation, for a fluid flowing turbulently inside a pipe, overestimates the heat transfer values. In this investigation, a review of the most important previous studies is presented. The steady-state local heat transfer characteristics for air flowing turbulently inside an electrically heated pipe have been determined experimentally over a range of Reynolds number from 12,000 to 55,000. A surface-boundary heating condition of uniform heat flux is imposed. A formula for predicting the rate of heat transfer is introduced. Qualitatively, the results are in good agreement with those of previous investigators. By employing the evolved equation, the rate of heat transfer is ∼ 15% lower than that predicted by the Dittus and Boelter formula.
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