Abstract
AbstractThis article presents a method for predicting local Nusselt numbers for heat transfer to a stratified gas‐liquid flow for turbulent liquid/turbulent gas conditions. A mathematical model based on the analogy between momentum transfer and heat transfer is developed and tested, using heat transfer and fluid mechanics data taken for air/water flow in a 63.5 mm I.D. tube. The fluid mechanics parameters required for the prediction of the heat transfer characteristics are obtained in the manner outlined elsewhere. Liquid phase Nusselt numbers predicted by the analogy are shown to be in agreement with experimental results for large and small amplitude wavy interfacial conditions. The circumferential average gas phase Nusselt numbers are in rough agreement with the Dittus‐Boelter equation for single phase flow based on flow through a conduit of irregular shape. There is a tendency for the average gas phase Nusselt numbers to scatter about predicted values because of the effects of splashing and droplet deposition on the tube wall in the vicinity of the gas‐liquid interface.
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