The Effect of a Surfactant on Flow Patterns, Pressure Drop and Heat Transfer in Two-Phase Two-Component Vertical Flow

Zaidi, Ahmed; Sims, G.E.

doi:10.1615/ihtc8.4620

Cited by 7 publications

(3 citation statements)

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“…From these results, it can be concluded that the influence of air on heat transfer is most pronounced at the lowest ReSL because air would be more effective in promoting turbulence there. Similar observations were also made by Groothuis and Hendal (1959), Kudirka et al (I965), and Zaidi and Sims (1986).…”

Section: Flow Patternssupporting

confidence: 86%

“…Some of the previous researchers also observed an increase in two-phase heat transfer as the gas Reynolds number increased for a fixed liquid Reynolds number. Zaidi and Sims (1986) observed from the results of their two-phase heat transfer measurements in a vertical pipe that hTP generally increased as the air flow rate was increased for each fixed liquid flow rate. Also, the increase in hTP was more significant at low ReSL than at high ReSL.…”

Section: Flow Patternsmentioning

confidence: 99%

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

Kim

2001

KSME International Journal

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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%.

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Section: Flow Patternssupporting

confidence: 86%

Section: Flow Patternsmentioning

confidence: 99%

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

Kim

2001

KSME International Journal

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“…4 Nusselt number due to the injection of the air stream in the case of low water flow rate higher than that in the case of high water flow rate. The same results were observed for two-phase flow in a vertical pipe by Groothuis and Hendal [23] and Zaidi and Sims [24] and and for a horizontal pipe at a constant heat flux by Kim [22]. These investigators found that the influence of the air on heat transfer was most pronounced at the lowest liquid Reynolds number.…”

Section: Air-water Two-phase Heat Transfer Datasupporting

confidence: 76%

Experimental Investigation and Empirical Correlations of Heat Transfer in Different Regimes of Air–Water Two-Phase Flow in a Horizontal Tube

Nada

2016

Journal of Thermal Science and Engineering Applications

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This article reports on the experimental investigation of heat transfer to cocurrent air–water two-phase flow in a horizontal tube. The idea is to enhance heat transfer to the coolant liquid by air injection. Experiments were conducted for different air water ratios in constant temperature heated tube. Visual identification of flow regimes was supplemented. The effects of the liquid and gas superficial velocities and the flow regimes on the heat transfer coefficients were investigated. The results showed that the heat transfer coefficient generally increases with the increase of the injected air flow rate, and the enhancement is more significant at low water flow rates. A maximum value of the two-phase heat transfer coefficient was observed at the transition to wavy-annular flow as the air superficial Reynolds number increases for a fixed water flow rate. It was noticed that the Nusselt number increased about three times due to the injection of air at low water Reynolds number. Correlations for heat transfer by air–water two-phase flow were deduced in dimensionless form for different flow regimes.

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Transition to Annular Flow in Two-Phase, Two-Component Vertical Flow: Examination of Correlations

Rezkallah

Sims

1991

Chemical Engineering Communications

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The Effect of a Surfactant on Flow Patterns, Pressure Drop and Heat Transfer in Two-Phase Two-Component Vertical Flow

Cited by 7 publications

References 0 publications

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

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

Experimental Investigation and Empirical Correlations of Heat Transfer in Different Regimes of Air–Water Two-Phase Flow in a Horizontal Tube

Transition to Annular Flow in Two-Phase, Two-Component Vertical Flow: Examination of Correlations

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