Calculations of Flow Boiling Heat Transfer in a Minichannel Based on Liquid Crystal and Infrared Thermography Data

Piasecka, Magdalena; Strąk, Kinga; Maciejewska, Beata

doi:10.1080/01457632.2016.1189272

Cited by 55 publications

(66 citation statements)

References 28 publications

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“…Values of the local heat transfer coefficient have proved higher when results from the enhanced heating surfaces were noticed [2][3][4]. Enhanced heating surfaces were produced using various techniques, e.g.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer research on enhanced heating surfaces in pool boiling

2017

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Abstract. The paper focuses on the analysis of the enhanced surfaces in such applications as boiling heat transfer. The testing measurement module with enhanced heating surfaces was used for pool boiling research. Pool boiling experiments were conducted with distilled water at atmospheric pressure in the vessel using an enhanced sample as the bottom heating surface. The samples are soldered to a copper heating block of the round cross-section .They were placed: in the fluid (saturation temperature measurement), under the sample for temperature determination. A vessel made of four flat glass panes was used for visualization. The heated surfaces in contact with the fluid differed in roughness were smooth or enhanced. This paper analyzes the effects of the microstructured heated surface on the heat transfer coefficient. The results are presented as relationships between the heat transfer coefficient and the heat flux and as boiling curves. The experimental data obtained for the two types of enhanced heated surfaces was compared with the results recorded for the smooth heated surface. The highest local values of the heat transfer coefficient were reported for the enhanced surfaces.

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Section: Introductionmentioning

confidence: 99%

Heat transfer research on enhanced heating surfaces in pool boiling

2017

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“…The supply and control system consists of a inverter welder (14), a shunt (15), an ammeter (16) and a voltmeter (17). The experimental setup was presented in detail in [9].…”

Section: Experimental Standmentioning

confidence: 99%

“…The resulting local heat transfer coefficients were obtained similarly as in [9,29] The heat transferred to the fluid in the minichannel was assumed to be equal to the difference between the heat generated by the heated plate and the heat loss to the surroundings according to the equation [9,29] …”

Section: Heat Transfer Coefficient Determinationmentioning

confidence: 99%

“…A review of literature relating to flow boiling heat transfer in minichannels with microstructured surfaces, smooth and enhanced, was presented in [7][8][9]. Focusing research on microstructured surface of heat exchangers with minichannels seems interesting because these surfaces provide a potential for further heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…One of the solutions is the use of boiling phenomena, the other -using enhanced heated surfaces produced by different methods [1][2][3]. Studies have been conducted on pool boiling [4][5][6], flow boiling [7][8][9][10][11] heat transfer and confined spaces as face seals [12,13]. Primarily passive methods are being developed for use in porous coating applications and in metal surface mechanical processing [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Fe powder sintering and soldering in production of porous heating surface on flow boiling heat transfer in minichannels

Depczyński

Piasecki²,

Piasecka

et al. 2017

E3S Web Conf.

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Abstract. This paper focuses on identification of the impact of porous heated surface on flow boiling heat transfer in a rectangular minichannel. The heated element for Fluorinert FC-72 was a thin plate made of Haynes-230. Infrared thermography was used to determine changes in the temperature on its outer smooth side. The porous surface in contact with the fluid in the minichannel was produced in two processes: sintering or soldering of Fe powder to the plate. The results were presented as relationships between the heat transfer coefficient and the distance from the minichannel inlet and as boiling curves. Results obtained for using a smooth heated plate at the saturated boiling region were also presented to compare. In the subcooled boiling region, at a higher heat flux, the heat transfer coefficient was slightly higher for the surface prepared via soldering. In the saturated boiling region, the local heat transfer coefficients obtained for the smooth plate surface were slightly higher than those achieved from the sintered plate surface. The porous structures formed have low thermal conductivity. This may induce noticeable thermal resistance at the diffusion bridges of the sintered structures, in particular within the saturated boiling region.

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