Film condensation in horizontal microchannels: Effect of channel shape

Wang, Huasheng; Rose, John

doi:10.1016/j.ijthermalsci.2006.03.004

Cited by 97 publications

(8 citation statements)

References 15 publications

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“…• The expressions in single phase model in (5)(6)(7)(8) are sufficient to conceive the influences of nanoparticles on the classical film condensation problem of [1] based on the theory of Nusselt [2].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Condensation of laminar film over curved vertical walls using single and two-phase nanofluid models

Türkyılmazoğlu

2017

European Journal of Mechanics - B/Fluids

101

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Section: Discussionmentioning

confidence: 99%

“…The condensation problem taking place through a channel of triangular shape was examined in detail in [7]. An anlysis was then provided in horizontal microchannel for the condensation of the film in [8]. In the work of [9] vertical plate and condensation of film but with an accelerating vapor flow was investigated.…”

Section: Introductionmentioning

confidence: 99%

Condensation of laminar film over curved vertical walls using single and two-phase nanofluid models

Türkyılmazoğlu

2017

European Journal of Mechanics - B/Fluids

101

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“…This correlation does not have any factor for the effect of corners. Hence its agreement with both circular and non-circular channels seems to contradict the results of CFD analyses such as those of Wang and Rose [5][6][7] which indicate that heat transfer is higher in channels with corners compared to round channels.…”

Section: Effect Of Channel Shapementioning

confidence: 80%

Prediction of Heat Transfer during Condensation in Non-Circular Channels

Shah

2019

Inventions

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It is desirable to know whether correlations for condensation in round tubes can be used for non-circular channels. To investigate this matter, a number of well-known correlations for mini and macro channels as well as some for flattened channels were compared to a database for condensation in non-circular channels. Data included square, rectangular, triangular, semi-circular, drum, N, and W shaped channels as well as flattened tubes. The data included 15 fluids, hydraulic diameter 0.067 to 1.46 mm, aspect ratio 0.14 to 7, reduced pressure 0.045 to 0.77, and mass flux from 48 to 1000 kgm −2 s −1 . None of the correlations worked well for flattened tubes. Data for all other shapes were best predicted by the Shah correlation with mean absolute deviation of 20.1% with 1120 data points from 22 sources. None of the other correlations was found satisfactory over the entire range.

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“…been developed by Wang et al [6] and described in detail by Wang and Rose [7] (see also [8][9][10][11][12][13][14][15] temperature which is less than that of the vapour so that condensation commences at the inlet. Fig.…”

Section: Condensation In Micro Channelsmentioning

confidence: 99%

Surface tension-affected laminar film condensation problems

Wang

Rose

2007

J Mech Sci Technol

Self Cite

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Following Nusselt [1] there were few developments in the theory of laminar film condensation until the advent of digital computers in the 1950s. Approximations used by Nusselt, namely neglect of inertia, convection and surface shear stress (for the free convection case) were then found to give very accurate results for the normal practical range of vapour-to-surface temperature difference. Subsequent developments treated the gas phase and dealt with superheated vapour, condensation in the presence of a non-condensing gas and condensation of mixtures. The temperature discontinuity at the vapour-liquid interface has been studied experimentally and theoretically since the 19 th century and more recently in the 1960s by experiments using liquid metals.In the present paper the focus is on the condensate film and, in particular, the role played by surface tension which is important for condensation on finned surfaces and in microchannels, owing to abrupt changes in curvature of the condensing surface. The way in which surface tension affects condensation heat transfer and difficulties which arise are first illustrated by reference to condensation on a smooth horizontal tube, where the effect of surface tension on heat transfer is minimal. Practically more relevant cases of condensation in microchannels and on finned surfaces and are then discussed and recent results presented.

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Film condensation in horizontal microchannels: Effect of channel shape

Cited by 97 publications

References 15 publications

Condensation of laminar film over curved vertical walls using single and two-phase nanofluid models

Condensation of laminar film over curved vertical walls using single and two-phase nanofluid models

Prediction of Heat Transfer during Condensation in Non-Circular Channels

Surface tension-affected laminar film condensation problems

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