Influence of the Surface Enhancement on the Flow Boiling Heat Transfer in a Minichannel

Piasecka, Magdalena; Strąk, Kinga

doi:10.1080/01457632.2018.1457264

Cited by 38 publications

(22 citation statements)

References 39 publications

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“…1. The test section with vertical minichannels is the main element of flow loop comprises, described in detail in [4,7,9,12,14,[30][31][32] Temperature changes on one side of the plate were measured with an E60 FLIR infrared camera (Fig.1, (13)) of accuracy: ± 1°C or ± 1%, temperature range: 0 ÷ 120°C [33]. The plate surface was coated with black paint (to obtain emissivity of 0.97).…”

Section: Experiments Standmentioning

confidence: 99%

“…In this paper, local heat transfer coefficients were determined using the one-dimensional method [12,14,31,32,39]. Heat flow direction perpendicular to the direction of the fluid flow in the minichannel was taken into account.…”

Section: Calculationsmentioning

confidence: 99%

“…The Kielce University of Technology has conducted a series of studies of flow boiling heat transfer with different refrigerants [4][5][6] flowing along minichannels with enhanced heated plates [4,[7][8][9][10][11][12][13][14] at various orientations [4,15,16]. The use of enhanced surfaces produced in thermal processes is known to intensify the heat transfer process as shown in [7,[17][18][19][20][21] Such surfaces are applied also in pool boiling heat transfer [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Impact of selected thermal and flow parameters on flow boiling heat transfer in a minichannel

Strąk

Piasecka

2019

EPJ Web Conf.

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This paper reports an impact of selected thermal and flow parameters i.e., mass flux and inlet pressure on flow boiling heat transfer in a minichannel. Research was carried out on the experimental set up with the test section fitted with a single, rectangular and vertically oriented minichannel 1.7 mm deep. Infrared thermography was used to determine changes in the temperature on the outer side of the heated minichannel wall in the central part of the minichannel. The heated element for HFE-649 flowing in the minichannel was a thin alloy plate, made of Haynes-230. Local values of heat transfer coefficient for stationary state conditions were calculated using a simple one-dimensional method. Analysis of the results was based on experimental series obtained for the same heat flux, various mass fluxes and average inlet pressures. The experimental results are presented as the relationship between the heat transfer coefficient and the distance along the minichannel length and boiling curves. The highest local heat transfer coefficients were obtained for the lower average inlet pressure and for the highest mass flux at lower heat flux.

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Section: Experiments Standmentioning

confidence: 99%

Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of selected thermal and flow parameters on flow boiling heat transfer in a minichannel

Strąk

Piasecka

2019

EPJ Web Conf.

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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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“…A lot of mathematical methods: analytical, analytical -numerical or numerical are applied for heat transfer calculation during flow boiling heat transfer in minigaps. Heat transfer coefficient computations using a onedimensional model proposed by the authors were described in papers [11][12][13][14]. The 1D model assumes that heat flux conducted through the heated wall and absorbed by the fluid from the wall, at the contact surface of the heater -fluid flowing in the minichannel, are equal.…”

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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Influence of the Surface Enhancement on the Flow Boiling Heat Transfer in a Minichannel

Cited by 38 publications

References 39 publications

Impact of selected thermal and flow parameters on flow boiling heat transfer in a minichannel

Impact of selected thermal and flow parameters on flow boiling heat transfer in a minichannel

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

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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