Subcooled flow boiling of R-134a in vertical channels of small diameter

Martín-Callizo, Claudi; Palm, Björn; Owhaib, Wahib

doi:10.1016/j.ijmultiphaseflow.2007.02.002

Cited by 33 publications

(11 citation statements)

References 16 publications

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“…Although the result of comparison is not always reported, ΔT W and q W at ONB are usually higher than those predicted by conventional correlations (Hapke et al, 2000;Kennedy et al, 2000;Martín-Callizo et al, 2007;Qi et al, 2007) with a certain number of exceptions (Inasaka et al, 1989;Liu et al, 2005). Even if the nucleation site density is constant, the total number of nucleation sites should be smaller in a microchannel because of its small surface area.…”

Section: Experimental Workmentioning

confidence: 86%

“…In mini and microchannels, several investigators reported that the wall superheats needed for boiling incipience can noticeably be higher than those predicted by the conventional correlations (Hapke et al, 2000;Kennedy et al, 2000;Martín-Callizo et al, 2007;Qi et al, 2007). Since the presence of bubbles alters the characteristics of the pressure loss and heat transfer as in the conventional-sized channels, accurate prediction of ONB is of importance in the design of the heat exchangers or the heat sinks using microchannels.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Onset of Nucleate Boiling in Mini and Microchannels: A Brief Review

Okawa¹

2012

Frontiers in Heat and Mass Transfer

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The present article summarizes the studies on the thermalhydraulic condition under which the onset of nucleate boiling (ONB) is triggered in subcooled flow boiling. Available correlations and experimental data show that the ONB is tended to be delayed in mini and microchannels. It is known that the ONB condition is significantly dependent on the surface condition even in conventional-sized channels. Accumulation of ONB data accompanied by the information on the surface condition is therefore considered of importance to elucidate the mechanisms of boiling incipience in microchannels. Discussion is also made for the bubble dynamics observed in mini and microchannels. It is indicated that the bubble behavior at ONB in mini and microchannels may significantly be different from that in conventional-sized channels and have greater impact on the system performance. Further studies on the bubble dynamics following nucleation at ONB are also requested to improve the design of heat transfer devices using mini and microchannels.

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Section: Experimental Workmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Onset of Nucleate Boiling in Mini and Microchannels: A Brief Review

Okawa¹

2012

Frontiers in Heat and Mass Transfer

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“…However, there are only a limited number of publications studying flow boiling and CHF from the experimental point of view [9][10][11][12]. Recently, Cikim [13] incorporated the effect of surface coatings on the boiling behaviour of this type of system.…”

Section: Introductionmentioning

confidence: 99%

On the effect of surface roughness and material on the subcooled flow boiling of water: Experimental study and global correlation

Paz

Conde

Suárez

et al. 2015

Experimental Thermal and Fluid Science

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.On the effect of surface roughness and material on the subcooled flow boiling of water: Experimental study and global correlation. AbstractIn this paper, a new correlation based on experimental results for subcooled flow boiling of water at low pressure is proposed, preceded by a brief review on how the solid-fluid interaction has been dealt with in past correlations. The experimental sample comprises seven heating surfaces of different material (copper, aluminium and stainless steel) and roughness. The experimental facility is presented in detail and the surface morphology of each test specimen is analysed by means of an optical interferometer. The correlation is based on the assumption that the effect of material and roughness can be captured by means of modifiers of a general expression. The surfaces chosen in this work were selected to capture a broad range of industrial applications, and, though the correlation found fits well in the range of commercial and relatively high values of R a (up to 7 µm in the case of copper), further study is needed for larger values, as a discontinuity in the effect was observed, which has been previously determined by some authors. Thus, the proposed global correlation permits the calculation of the boiling heat flux taking into account, in addition to the more classical parameters such as pressure and bulk temperature, the effect of both the roughness and material of the wall heater, allowing its general use in low pressure applications such as those commonly found in the automotive industry.

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“…They also found that the Kandlikar's flow boiling correlation covers the higher mass flux range, with a 10.7% mean deviation. Martin-Calizo et al [8] experimentally investigated the subcooled flow boiling heat transfer, for R-134a, in vertical cylindrical tubes with various internal diameters of 0.83, 1.22, and 1.70 mm and found that the classical correlations of the boiling heat transfer could not predict the experimental heat transfer coefficient for all tested conditions.…”

Section: Introductionmentioning

confidence: 99%

“…However, the boiling phenomena inside the evaporator are difficult to define theoretically; even the theoretical setup cannot explain the phenomena in various conditions [8]. A few research studies have been carried out on the optimal design of the evaporator.…”

Section: Introductionmentioning

confidence: 99%