Local Bundle Boiling Heat Transfer Coefficients on a Plain Tube Bundle (RP-1089)

Robinson, D. M.; Thome, John R.

doi:10.1080/10789669.2004.10391089

Cited by 22 publications

(23 citation statements)

References 4 publications

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“…This local method has been successfully used by Zürcher et al [32] for evaporation inside tubes and by Robinson and Thome [33] for local boiling coefficients on the outside of tubes in tube bundles. The local overall heat transfer coefficient U o is:…”

Section: Local Heat Transfer Calculation Principlementioning

confidence: 96%

Falling Films on Arrays of Horizontal Tubes with R-134a, Part I: Boiling Heat Transfer Results for Four Types of Tubes

Roques

Thome

2007

Heat Transfer Engineering

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A new falling film heat transfer test facility has been built for the measurement of local heat transfer coefficients on a vertical array of horizontal tubes, including flow visualization capabilities, for use with refrigerants. Presently, the facility has been used for evaporation tests on four types of tubes at three tube pitches and three nominal heat flux levels for R-134a at 5 • C. A new method for determining local heat transfer coefficients using hot water heating has been applied, and test results for a wide range of liquid film Reynolds numbers have been measured for arrays made of plain, Turbo-BII HP, Gewa-B, and High-Flux tubes. The results show that there is a transition to partial dryout as the film Reynolds number is reduced, marked by a sharp falloff in heat transfer. Above this transition, the heat transfer coefficients are nearly insensitive to the filmReynolds number, apparently because vigorous nucleate boiling is always seen in the liquid film. The corresponding nucleate pool boiling data for the four types of tubes were also measured for direct comparison purposes. Overall, about 15,000 local heat transfer data points were obtained in this study as a function of heat flux, film Reynolds number, tube spacing, and type.

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Section: Local Heat Transfer Calculation Principlementioning

confidence: 96%

Falling Films on Arrays of Horizontal Tubes with R-134a, Part I: Boiling Heat Transfer Results for Four Types of Tubes

Roques

Thome

2007

Heat Transfer Engineering

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“…To determine the external local heat transfer coefficient, a o , between the outside surface of the copper tubes and the refrigerant, a modified Wilson plot procedure using nucleate pool boiling (as in [14]) on the outside of the tubes was implemented. During modified Wilson plot tests, it was not possible to maintain the heat flux exactly constant, and there is a maximum variation of about ±4%.…”

Section: Data Reduction and Uncertaintiesmentioning

confidence: 99%

Experimental study on the onset of local dryout in an evaporating falling film on horizontal plain tubes

Ribatski

Thome

2007

Experimental Thermal and Fluid Science

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“…Close temperatures of each pair of thermocouples indicate a good mixing of water, helping to increase the accuracy of the data reduction method. To determine the external local heat transfer coefficient, h, between the outside surface of the copper tubes and the refrigerant, a modified Wilson plot procedure with nucleate pool boiling (as [39]) on the outside of the tubes was implemented. The modified Wilson plot method takes into account slight variations in the heat flux by assuming a relation for the external heat transfer coefficient given by h ¼ C o q 0:7 0 .…”

Section: Data Reductionmentioning

confidence: 99%

Nucleate boiling heat transfer of R134a on enhanced tubes

Ribatski

Thome

2006

Applied Thermal Engineering

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Local Bundle Boiling Heat Transfer Coefficients on a Plain Tube Bundle (RP-1089)

Cited by 22 publications

References 4 publications

Falling Films on Arrays of Horizontal Tubes with R-134a, Part I: Boiling Heat Transfer Results for Four Types of Tubes

Falling Films on Arrays of Horizontal Tubes with R-134a, Part I: Boiling Heat Transfer Results for Four Types of Tubes

Experimental study on the onset of local dryout in an evaporating falling film on horizontal plain tubes

Nucleate boiling heat transfer of R134a on enhanced tubes

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