Abstract: A physical model and a mathematical model were established in order to describe and improve the“vapor-phase resistance method”of Bell and Ghaly.Considering the effect of ripples at the interface onvapor-phase resistance,a correction factor v_ιwas proposed.Another factor (θ/π)βwhich correctsthe influence of the liquid pool along the bottom of the horizontal tube on the liquid-phase heat transfercoefficient was derived and the relationship of θand βwas correlated.The heat transfer coefficient pre-dicted by Bell’s method are approximately 10—15% lower than the experimental values if the effect ofripples on vapor-phase resistance has not been taken into account.The comparison of the predicted valuesof h_c from the modified vapor-phase resistance method with the experimental data showed a deviation of±10%.

摘要： A physical model and a mathematical model were established in order to describe and improve the“vapor-phase resistance method”of Bell and Ghaly.Considering the effect of ripples at the interface onvapor-phase resistance,a correction factor v_ιwas proposed.Another factor (θ/π)βwhich correctsthe influence of the liquid pool along the bottom of the horizontal tube on the liquid-phase heat transfercoefficient was derived and the relationship of θand βwas correlated.The heat transfer coefficient pre-dicted by Bell’s method are approximately 10—15% lower than the experimental values if the effect ofripples on vapor-phase resistance has not been taken into account.The comparison of the predicted valuesof h_c from the modified vapor-phase resistance method with the experimental data showed a deviation of±10%.