Heat transfer correlations for air-water two-phase flow of different flow patterns in a horizontal pipe

Abstract

Heat transfer coefficients were measured and new correlations were developed for two-phase heat transfer in a horizontal pipe for different flow patterns. Flow patterns were observed in a transparent circular pipe (2.54 ern 1. D. and L/D=96) using an air/water mixture. Visual identification of the flow patterns was supplemented with photographic data, and the results were plotted on the flow regime map proposed by Taitel and Dukler and agreed quite well with each other. A two-phase heat transfer experimental setup was built for this study and a total of 150 two-phase heat transfer data with different flow patterns were obtained under a uniform wall heat flux boundary condition. For these data, the superficial Reynolds number ranged from 640 to 35,500 for the liquid and from 540 to 21,200 for the gas. Our previously developed robust two-phase heat transfer correlation for a vertical pipe with modified constants predicted the horizontal pipe air-water heat transfer experimental data with good accuracy. Overall the proposed correlations predicted the data with a mean deviation of 1.0% and an rms deviation of 12%.

A Model for Temperature Prediction for Two-Phase Oil/Water Stratified Flow

“…Matzain [14] compared the correlations recommended by Kim et al [13] with experimental data and found that the discrepancies between the predictions from correlations and experimental data are significant. Further investigation on heat transfer was suggested for twophase flow by Matzain [14].…”

“…Based on experimental data collected from the open literature, Kim et al [13] evaluated 20 heat transfer correlations and made recommendations for different flow patterns. Matzain [14] compared the correlations recommended by Kim et al [13] with experimental data and found that the discrepancies between the predictions from correlations and experimental data are significant.…”

Evaporative Heat Transfer of Annular Two-phase Flow of Air-water in a Small Vertical Tube

“…Both the void fraction and superficial velocity ratio are very large and exceed the applicability ranges of the all correlations (u a =u l,0 % 0.01 $ 100, for general two-phase flow) listed in the literature (Kim et al, 1999(Kim et al, , 2000. Figure 8 shows the experimental results of the inlet Nusselt number versus the air Reynolds number for b max ¼ 0.5.…”

“…In general, previous studies concerning two-phase flow mainly investigated the various two-phase regime maps and heat transfer characteristics in large-scale tubes. Most recently, Kim et al (1999Kim et al ( , 2000 carried out the evaluations of several heat transfer correlations for two-phase flow with different flow patterns in vertical and horizontal large-scale tubes. They recommended some appropriate correlations for different flow patterns and tube orientations based on the tabulated and graphical results.…”

Unified Model of Heat Transfer in Gas/Liquid Pipe Flow

“…Kim et al (1997) evaluated 20 heat-transfer correlations against experimental data collected from the open literature and made recommendations for different flow patterns and inclination angles. However, these recommended correlations did not give satisfactory predictions when compared with experimental results by Matzain (1999).…”