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Research Papers: Evaporation, Boiling, and Condensation

Convective Boiling of R-134a Near the Micro-Macroscale Transition Inside a Vertical Brazed Plate Heat Exchanger

[+] Author and Article Information
Hyun Jin Kim

Department of Mechanical
Science and Engineering,
University of Illinois at Urbana-Champaign,
Urbana, IL 61801
e-mail: hkim257@illinois.edu

Leon Liebenberg

Department of Mechanical Science
and Engineering,
University of Illinois at Urbana-Champaign,
Urbana, IL 61801
e-mail: leonl@illinois.edu

Anthony M. Jacobi

Professor
Fellow ASME
Department of Mechanical
Science and Engineering,
University of Illinois at Urbana-Champaign,
Urbana, IL 61801
e-mail: a-jacobi@illinois.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 11, 2017; final manuscript received February 5, 2018; published online May 7, 2018. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 140(9), 091501 (May 07, 2018) (10 pages) Paper No: HT-17-1533; doi: 10.1115/1.4039397 History: Received September 11, 2017; Revised February 05, 2018

Heat transfer and pressure drop characteristics of R-134a boiling in a chevron-patterned brazed plate heat exchanger (BPHE) are studied experimentally. With corrugated BPHE channels having hydraulic diameter of 3.4 mm and low refrigerant mass flux, boiling near the micro-macroscale transition is speculated. Heat exchanger performance is characterized with varying mass flux (30–50 kgm−2s−1), saturation pressure (675 kPa and 833 kPa), heat flux (0.8 and 2.5 kWm−2), and vapor quality (0.1–0.9). The two-phase refrigerant heat transfer coefficient increases with heat flux as often observed during nucleate boiling. It also weakly increases with saturation pressure and the associated lower latent heat during convective boiling; heat transfer is improved by the decreased liquid film thickness surrounding confined bubbles inside the narrow BPHE channels, which is the main characteristic of microscale boiling. As often observed in macroscale boiling, the inertial forces of the liquid and vapor phases cause an unsteady annular film, leading to premature partial dryout. The onset of dryout is accelerated at the lower saturation pressure, due to increased surface tension, another microscale-like characteristic. Higher surface tension retains liquid in sharp corners of the corrugated channel, leaving lateral surface areas of the wall dry. Two-phase pressure drop increases with mass flux and vapor quality, but with decreasing saturation pressure. Dryout decreases the friction factor due to the much lower viscosity of the gas phase in contact with the wall. Several semi-empirical transition criteria and correlations buttress the current analyses that the thermal-fluidic characteristics peculiar to BPHEs might be due to macro-microscale transition in boiling.

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Figures

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Fig. 1

Schematic of the experimental setup

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Fig. 3

Heat transfer coefficient variations with the Reynolds number for the single-phase water-ethylene glycol mixture stream of the BPHE

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Fig. 4

Heat transfer coefficient (a) at varying heat and mass fluxes with constant saturation pressure and (b) at different saturation pressures, while keeping the mass flux constant (dashed curves are included to improve readability)

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Fig. 5

Two-phase (a) pressure drop and (b) friction factor (dashed curves are included to improve readability)

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Fig. 6

Comparison of experimental data with correlations developed by Amalfi et al. [13,14]: (a) macroscale model and (b) microscale model

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Fig. 7

Comparison of experimental friction factor values with predictions: Amalfi et al. [13,14] and Khan et al. [8]

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Fig. 8

Comparison of experimental data with various existing correlations: (a) Danilova et al., 1981 (as cited in Amalfi et al. [13,14]), (b) Donowski and Kandlikar [41], (c) Han et al. [42], (d) Huang et al. [5], (e) Hsieh and Lin [7], and (f) Hsieh and Lin [43]

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