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

Kaniowski, Robert; Pastuszko, Robert

doi:10.1051/epjconf/201818002041

Cited by 19 publications

(10 citation statements)

References 16 publications

(18 reference statements)

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“…Thermal and visualization measurements were made at the measurement stand, Fig. 1 [5][6][7][8], which allowed measuring the temperature difference between the working fluid and the heating surface and determining the heat flux. These parameters are necessary to determine the boiling curves.…”

Section: Methodsmentioning

confidence: 99%

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Study of pool boiling heat transfer with FC-72 on open microchannel surfaces

et al. 2019

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The paper presents investigations into pool boiling heat transfer for open microchannel surfaces. The experiments were carried out with saturated FC-72 at atmospheric pressure. Parallel microchannels fabricated by machining were about 0.2 to 0.4 mm wide and 0.2 to 0.5 mm deep. Analyzed surfaces with microchannels allowed to obtain heat transfer coefficients within the range of 6.1 – 9.8 kW/m2K, which in relation to the flat surface gives a 3 – 5 - fold increase in HTC. One of the reasons for the increase in the heat transfer coefficient when increasing the heat flux was the growing number of active nucleation sites at the bottom of microchannels and its side surfaces.

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Section: Methodsmentioning

confidence: 99%

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

Section: Introductionmentioning

confidence: 99%

Study of pool boiling heat transfer with FC-72 on open microchannel surfaces

et al. 2019

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“…Recent results were presented in [9][10][11][12][13]. The use of enhanced surfaces produced in thermal processes is known to intensify the heat transfer process [14][15][16][17], also in pool boiling heat transfer [18][19][20][21][22][23][24][25]. Heat transfer in confined spaces as face seals were analyzed in [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Cooling liquid flow boiling heat transfer in an annular minigap with an enhanced wall

Piasecka

Musiał

Piasecki³

2019

EPJ Web Conf.

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The paper focused on flow boiling heat transfer in an annular minigap. This gap of 1 mm width was created between the metal pipe with an enhanced surface contacting fluid and the external glass pipe positioned along the same axis. The heated element for the HFE-649 flowing in the minigap was a cartridge heater. Thermocouples were used to measure the temperature of the metal pipe in the contact surface with a fluid. The local values of the heat transfer coefficient for stationary state conditions were calculated using an one-dimensional method in which the multilayer cylindrical wall was assumed to be planar. The results were presented as a function of the heat transfer coefficient along the minigap length and as boiling curves, prepared for selected values of mass flow rate and five types of the enhanced heated surface and a smooth one. Observations indicated that the highest local values of heat transfer coefficient were obtained with using the enhanced surface produced by electromachining process (spark erosion) at the saturated boiling region. The boiling curves generated for two distances from the minigap inlet have similar plots without a drop in the temperature of the heated surface characteristic for nucleation hysteresis.

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“…The Kielce University of Technology has been conducting studies on pool boiling heat transfer with water, ethanol, FC-72 and Novec-649 from tunnel structures, microfins, microchannels, microcavities [6][7][8][9][10] and boiling heat transfer with FC-72 flowing in narrow channels [11][12][13][14][15] for more than a decade.…”

Section: Introductionmentioning

confidence: 99%

Pool boiling visualization of Novec-649 and FC-72 on copper microchannels

Kaniowski

Pastuszko

2019

EPJ Web Conf.

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Saturated pool boiling from copper microchannel surfaces was examined using Novec-649 and FC-72 as working fluids. Parallel microchannels fabricated by machining were about 0.2 mm wide, and 0.2 to 0.4 mm deep and spaced every 0.4 mm. The experiments were carried out at atmospheric pressure. The images of the growing and departing bubbles for the entire surface of the specimen were taken with a Photonfocus PHOT MV-D1024-160-CL camera and an EX-FH20 (Casio) camera. At low superheats, the bubbles departing from enhanced surfaces were spherical in shape and did not coalesce. At higher superheats, the bubbles interacted with each other intensively, forming flattened spherical, funnel-shaped bubbles at the bottom. The visualization study aimed at identifying nucleation sites of the departing bubbles and determining their diameters and frequency at various superheats.

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

Cited by 19 publications

References 16 publications

Study of pool boiling heat transfer with FC-72 on open microchannel surfaces

Study of pool boiling heat transfer with FC-72 on open microchannel surfaces

Cooling liquid flow boiling heat transfer in an annular minigap with an enhanced wall

Pool boiling visualization of Novec-649 and FC-72 on copper microchannels

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