Effect of geometrical parameters of open microchannel surfaces on pool boiling heat transfer

Kaniowski, Robert; Pastuszko, Robert; Nowakowski, Łukasz

doi:10.1051/epjconf/201714302049

Cited by 29 publications

(22 citation statements)

References 9 publications

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“…Figures 4a and 4b show HTC/heat flux and heat flux/ temperature superheat relationships at increasing heat flux on MF and MC surfaces for the boiling of water. Some of the data were taken from [3,15,16]. Surfaces with micro-channels provide higher coefficients, as shown by the noticeable increase in heat transfer relative to surfaces with micro-fins.…”

Section: Resultsmentioning

confidence: 99%

Comparison of heat transfer coefficients of open micro-channels and plain micro-fins

Kaniowski

Pastuszko

2018

EPJ Web Conf.

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The paper describes results of analysis of pool boiling heat transfer on enhanced surfaces. Two types of structural surfaces were used: open microchannel surfaces consisting of a system of parallel micro-channels 0.3 mm wide, from 0.2 to 0.5 mm deep and with a pitch of 0.6 mm, and plain micro-fins 0.5 mm in height, uniformly spaced on the base surface with a spacing from 0.6 to1.5 mm. Pool boiling data at atmospheric pressure were obtained for saturated water, ethanol and FC-72. The effects of micro-channel/micro-fin dimensions on heat transfer coefficient in nucleate pool boiling were examined. Substantial enhancement of heat transfer coefficient was observed.

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Section: Resultsmentioning

confidence: 99%

Comparison of heat transfer coefficients of open micro-channels and plain micro-fins

Kaniowski

Pastuszko

2018

EPJ Web Conf.

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“…Bubble diameters were measured in two directions and the arithmetic mean was determined at a constant heat flux. The absolute error of bubble diameter measurement was 2 pixels, i.e., 0.2 mm [7].…”

Section: Experimental Investigationsmentioning

confidence: 99%

“…Research on pool boiling heat transfer with water, ethanol, FC-72 and Novec-649 from tunnel structures, microfins, microchannels, microcavities [5][6][7][8][9][10] and boiling heat transfer with FC-72 flowing in narrow channels [11][12][13] has been conducted at the Kielce University of Technology for more a decade.…”

Section: Introductionmentioning

confidence: 99%

Pool boiling of ethanol and FC-72 on open microchannel surfaces

Kaniowski

Pastuszko

2018

EPJ Web Conf.

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The paper presents experimental investigations into pool boiling heat transfer for open microchannel surfaces. Parallel microchannels fabricated by machining were about 0.3 mm wide, and 0.2 to 0.5 mm deep and spaced every 0.1 mm. The experiments were carried out for ethanol, and FC-72 at atmospheric pressure. The image acquisition speed was 493 fps (at resolution 400 × 300 pixels with Photonfocus PHOT MV-D1024-160-CL camera). Visualization investigations aimed to identify nucleation sites and flow patterns and to determine the bubble departure diameter and frequency at various superheats. The primary factor in the increase of heat transfer coefficient at increasing heat flux was a growing number of active pores and increased departure frequency. Heat transfer coefficients obtained in this study were noticeably higher than those from a smooth surface.

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“…The application of an enhancement of the heated plate surface may increase the intensity of heat transfer [5,6]. In the literature, [7][8][9][10] the results of pool boiling heat transfer when the enhancement of the heated surface was applied in the form of mini-fins were described.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the 1D and 2D calculation models used for determination of the heat transfer coefficient during flow boiling heat transfer in a minichannel

2019

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The paper discusses the results of the flow boiling heat transfer in a vertical minichannel with rectangular cross-section. The heating element for FC-72 flowing in the minichannel is a thin plate. Infrared thermography is used to determine changes in the temperature on its outer side. The aim of the calculation is to determine the heat transfer coefficient using 1D and 2D calculation models. Local values of heat transfer coefficient on the surface between the heated plate and boiling fluid are calculated from the Newton`s and Fourier`s laws. In 2D model the plate temperature distribution is obtained by solving the inverse heat conduction problem. The governing equation is solved by means of two methods: the non-continuous Trefftz method and the Beck method. The results are presented as plate temperature and heat transfer coefficient calculated using 1D and 2D models as a function of the distance from the minichannel inlet. The analysis of the results revealed that the values and distributions of the heat transfer coefficient calculated by means of both models were similar. This suggests that all mentioned methods are interchangeable.

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Effect of geometrical parameters of open microchannel surfaces on pool boiling heat transfer

Cited by 29 publications

References 9 publications

Comparison of heat transfer coefficients of open micro-channels and plain micro-fins

Comparison of heat transfer coefficients of open micro-channels and plain micro-fins

Pool boiling of ethanol and FC-72 on open microchannel surfaces

Comparison of the 1D and 2D calculation models used for determination of the heat transfer coefficient during flow boiling heat transfer in a minichannel

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