Pool boiling visualization on open microchannel surfaces

Kaniowski, Robert; Pastuszko, Robert

doi:10.1051/epjconf/201714302050

Cited by 8 publications

(5 citation statements)

References 10 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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“…Large mass droplets show instabilities of various types, which result from complex convective movements inside the droplet [31][32][33][34]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Leidenfrost evaporation of water droplet

Orzechowski

2018

MATEC Web Conf.

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The present paper examines the behaviour of a single large droplet levitating over a hot surface, unsteady mass of the droplet, and heat transfer. It was assumed that the evaporation from the upper surface of the droplet is negligibly small compared with the amount discharged from its lower surface, and the heat transfer coefficient is the power function of droplet orthogonal projection onto the heating surface. Based on the photographic documentation, the dependence of the droplet projection on time was approximated. A heat balance was written in the form of a non-linear first order differential equation. The solution to the equation was included. The analytical function of droplet mass change in time was used to determine the exponent of the power dependence of the heat transfer coefficient on the orthogonal droplet projection onto the heating surface. The comparison showed the method proposed in the study could be applied to analyse the behaviour of a water drop levitating above a surface at the temperature higher than the Leidenfrost point.

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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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Pool boiling visualization on open microchannel surfaces

Cited by 8 publications

References 10 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

Leidenfrost evaporation of water droplet

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

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