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Research Papers: Heat Transfer Enhancement

# Heat Transfer Enhancement Using Laminar Gas-Liquid Segmented Plug Flows

[+] Author and Article Information
Y. S. Muzychka

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, Canada

E. J. Walsh, P. Walsh

Stokes Research Institute, University of Limerick, Castletroy, County Limerick, Ireland

J. Heat Transfer 133(4), 041902 (Jan 11, 2011) (9 pages) doi:10.1115/1.4002807 History: Received May 06, 2009; Revised September 25, 2010; Published January 11, 2011; Online January 11, 2011

## Abstract

Heat transfer enhancement using segmented nonboiling gas-liquid flow is examined. Segmentation results in a two phase flow of liquid/gas having a constant liquid fraction; i.e., no phase change occurs. In this flow configuration, enhanced heat transfer occurs as a result of a shorter effective thermal length due to internal fluid circulation in the liquid plugs. A simple theory for laminar segmented flows is developed based on scaled Graetz theory and comparisons made with existing published data from the literature and new experimental data obtained in a companion study. The proposed model is valid for an isothermal tube wall provided that the axial residence time of the flow is such that dimensionless tube length $L⋆<0.1$.

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## Figures

Figure 8

Data of Horvath (4) replotted considering plug length and liquid fraction

Figure 1

Gas-liquid plug flow for different liquid slug lengths

Figure 2

Internal liquid plug circulation: (a) hydrophobic surface and (b) hydrophyllic surface

Figure 3

Ideal plug flow heat transfer

Figure 4

Q⋆ for segmented slug and Poiseuille Graetz flows having the same ṁ and no secondary flow mechanism

Figure 5

Q⋆ for segmented slug versus continuous Poiseuille Graetz flows having the same ṁ and no secondary flow mechanism

Figure 6

All data plotted using nondimensional scaling consistent with total tube length when reducing data

Figure 7

Data of Oliver and Young-Hoon (6-7) replotted considering plug length and liquid fraction

Figure 10

Data of Walsh (15) replotted considering plug length and liquid fraction

Figure 11

All data replotted considering plug length and liquid fraction in the data reduction

Figure 9

Data of Vrentas (8) and Narayanan and Lakehal (11) replotted considering plug length and liquid fraction

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