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Research Papers: Evaporation, Boiling, and Condensation

Flow-Pattern Based Heat Transfer Correlations for Stable Flow Boiling in Micro/Minichannels

[+] Author and Article Information
Zan Wu

Department of Energy Sciences,
Lund University,
Lund SE-22100, Sweden

Bengt Sundén

Department of Energy Sciences,
Lund University,
Lund SE-22100, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 10, 2014; final manuscript received September 30, 2015; published online November 17, 2015. Assoc. Editor: Keith Hollingsworth.

J. Heat Transfer 138(3), 031501 (Nov 17, 2015) (9 pages) Paper No: HT-14-1666; doi: 10.1115/1.4031882 History: Received October 10, 2014; Revised September 30, 2015

Flow-pattern based heat transfer correlations for elongated bubbly flow and annular flow in stable flow boiling micro/minichannels were developed separately based on a collected micro/minichannel heat-transfer database by using an improved conventional-to-micro/minichannel threshold Bo = 4 and BoRel0.5 = 200, where Bo is the Bond number and Rel is the liquid Reynolds number. As significant disagreement in experimental trends and heat transfer mechanisms was reported for flow boiling in micro/minichannels in the literature, it is not possible to explain the discrepancy and predict all data points by a single correlation without considering the different flow patterns. The newly developed flow-pattern based predictive tool cannot only present a decent overall accuracy, but also estimate the parametric trends relatively well. Over 95% of the data points can be predicted by the proposed correlations within a ±50% error band for both elongated bubbly flow and annular flow. Therefore, the flow-pattern based correlations can be applied for heat exchanger design to improve the understanding of the underlying heat transfer mechanisms and to guide the development of further enhancement techniques for flow boiling in micro/minichannels.

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Figures

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Fig. 1

The conventional-to-micro/minichannel threshold

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Fig. 2

(a) Pair frequency and (b) dimensionless initial film thickness versus vapor quality for R134a, dh = 0.51 mm, G = 309 kg m−2 s−1, q = 20–55 kW m−2, and Tsat = 31 °C

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Fig. 3

Boiling number distribution of the elongated bubbly flow database. The transition Boiling number Bltransition is approximately 0.0005.

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Fig. 4

Heat transfer correlation for annular flow

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Fig. 5

Annular film with interfacial waves [69]

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Fig. 6

Evaluation of the newly developed flow-pattern based correlations: (a) elongated bubbly flow and (b) annular flow

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Fig. 9

Parametric-trend analysis of the new flow-pattern based predictive tool: (a) Ong and Thome [43] at Tsat = 31 °C; (b) Shiferaw et al. [45] at Psat = 6 and 8 bar; (c) Ducoulombier et al. [50] at Tsat = 0 °C; and (d) Tibirica et al. [56] at Tsat = 31 °C

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Fig. 8

Overall comparison of the new correlation, the Lazarek and Black correlation [70], the Kew and Cornwell correlation [18], and the Li and Wu correlation [71] for annular flow

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Fig. 7

Overall comparison of the new correlations, the Lazarek and Black correlation [70], the Kew and Cornwell correlation [18], and the Li and Wu correlation [71] for elongated bubbly flow

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