A Mechanistic Approach for Heat Transfer Estimation in Horizontal and Vertical Non-Boiling Two-Phase Pipe Flow

A mechanistic model is proposed to estimate heat transfer coefficient for non-boiling two-phase flow in horizontal and vertical pipes using analogy between friction factor and heat transfer. The proposed mechanistic correlation is validated by using experimentally measured heat transfer data. Evaluation of the mechanistic correlation with the measured heat transfer data indicated that the analogy between friction factor and heat transfer can be used with reasonable accuracy for heat transfer prediction in non-boiling two-phase pipe flow. Comparison with experimental results showed that the bulk of the data points were predicted within ±30 % by the mechanistic model. 1.