A Mechanistic Heat Transfer Correlation for Non-Boiling Two-Phase Flow in Horizontal, Inclined and Vertical Pipes

Abstract

A mechanistic heat transfer correlation is proposed to estimate heat transfer coefficient for non-boiling two-phase flow in horizontal, slightly inclined, and vertical pipes using the analogy between friction factor and heat transfer. Local heat transfer coefficients, pressure drops and flow parameters were measured for air-water flow in a 27.9 mm stainless steel pipe. The heat transfer and pressure drop data were collected by carefully coordinating the gas and liquid superficial Reynolds numbers. 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 predictions 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.

Experimental Investigation and Empirical Analysis of Non-Boiling Gas-Liquid Two Phase Heat Transfer in Vertical Downward Pipe Orientation

“…The study of Chu and Jones [3] and Oshinowo et al [2] did not verify Reynolds analogy for vertical downward flow. Here we have showed the use of Reynolds analogy applicable to two phase flow to predict the two phase heat transfer coefficient as reported by Tang and Ghajar [1]. The connection between two phase heat transfer and two phase pressure drop is as shown in Equation (1).…”

“…Here we have showed the use of Reynolds analogy applicable to two phase flow to predict the two phase heat transfer coefficient as reported by Tang and Ghajar [1]. The connection between two phase heat transfer and two phase pressure drop is as shown in Equation (1). More details about this equation can be obtained from Tang and Ghajar [1].…”

“…The connection between two phase heat transfer and two phase pressure drop is as shown in Equation (1). More details about this equation can be obtained from Tang and Ghajar [1].…”

“…The details about calculation of the flow pattern factor (F p ) can be obtained from Tang and Ghajar [1]. The single phase fanning friction factor (f) to be used to calculate single phase frictional pressure drop is calculated using Equations 3…”

“…The purpose of this work is to present new data on two phase convective heat transfer coefficient for all flow patterns occurring in vertical downward flow and occupying the entire range of void fraction and compare it against different heat transfer coefficient correlations available in the literature. The concept of Reynolds analogy to determine heat transfer coefficient based on the pressure drop data reported by Tang and Ghajar [1] is also studied here. Exclusively for vertical downward flow, there are only two correlations available in the literature given by Oshinowo et al [2] and Chu and Jones [3].…”