New cooling approach using successive evaporation and condensation of a liquid film inside a vertical mini-channel

Najim, Monssif; Feddaoui, M’barek; Alla, Abderrahman Nait; Charef, Adil; Kabeel, A.E.

doi:10.1016/j.ijheatmasstransfer.2018.02.034

Cited by 19 publications

(8 citation statements)

References 45 publications

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“…Initially, they were used to cool electronic devices (Tuckerman and Pease, 1981) but now there are a lot more of application where minichannels or minigaps can be found. There are among others: power industry (Mikielewicz & Mikielewicz, 2010), space industry (Brutin et al 2013), automotive industry (Sakamatapan & Wongwises, 2014), avionics industry (Najim & Feddaoui, 2018), solar industry (Zhou et al 2017), cryogenic industry (Zhou et al 2014), refrigeration industry (García-Cascales et al 2017), chemical and biological industry (Amador et al 2004). There are also some works that are trying to combine the minichannels with nanofluids (Uysal et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The maldistribution is not examined well enough and there are inconsistencies in reports about reasons, predictions and methods of reduction. Moreover, there are a lot of works that are dealing with a maldistribution phenomenon in parallel minichannels (Dąbrowski et al 2019;García-Cascales et al 2017;Najim & Feddaoui, 2018;Dąbrowski et al 2017;Sakamatapan & Wongwises, 2014;Yang et al 2017;Zhou et al 2014) but few that mentioned about flow non-uniformity and non-uniform temperature field in minigaps (Alam et al 2013;Mathew et al 2019;Tamanna & Lee, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Mitigation of Flow Maldistribution in Minichannel and Minigap Heat Exchangers by Introducing Threshold in Manifolds

Dąbrowski

2020

JAFM

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In the present paper, a detailed numerical investigation has been carried out to analyze the flow maldistribution in 50 parallel rectangular cross-section (1 mm depth and 1 mm width) minichannels and minigap section (1 mm depth and 99 mm width) with rectangular/trapezoidal manifolds in Z-type flow configuration. The author carried out numerical investigation with various mass flow rates, namely 0.05 kg/s, 0.1 kg/s and 0.2 kg/s which results in Reynolds number of 1532, 3064, 6128 respectively. A novel approach for the mitigation of non-uniform flow has been proposed introducing threshold at the entrance of the minigeometry section. The conventional case without threshold (as reference) and 1 mm, 3 mm and 7 mm threshold were introduced. The threshold has been employed by making a manifolds' depth bigger than section's depth. The maldistribution coefficient can be reduced twice in minigap section or three times in the minichannel section already with the 1 mm threshold as compared to the arrangement without threshold. It is found that rectangular manifold gives lower maldistribution coefficient than trapezoidal manifold which corresponds with actual state of the art. The distribution is more uniform in minichannel section than in minigap section for the same inlet parameters. To obtain uniform distribution of fluid flow should be stabilized already at the inlet manifold, at the entrance to the minichannel or minigap section. That was done by introducing the threshold in the manifolds, which is novelty of this study.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mitigation of Flow Maldistribution in Minichannel and Minigap Heat Exchangers by Introducing Threshold in Manifolds

Dąbrowski

2020

JAFM

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“…Mini-or microchannel heat exchangers are widely used in many industries: 1. the power industry (water cooled turbine blades, rocket nozzle cooling, fusion reactor blanket cooling, and domestic micro CHP) (Hall and Mudawar, 1999;Mikielewicz and Mikielewicz, 2010;Nacke et al, 2011;Ornatskii and Vinyarskii, 1965;Sturgis and Mudawar, 1999), 2. the electronics industry (microprocessors, LED cooling) (Bahiraei and Heshmatian, 2017;Jajja et al, 2014;Ramos-Alvarado et al, 2013), 3. the avionics industry (avionics cooling) (Najim and Feddaoui, 2018), 4. the space industry (cooling of satellite electronics) (Brutin et al, 2013), 5.the solar industry (solar, photovoltaic panels) (Robles et al, 2014;, 6. the automotive industry (multiport condensers) (Sakamatapan and Wongwises, 2014) , 7..the chemical and biological industry (Berthier et al, 2015;JY et al, 2015;P. Zhou et al, 2017), 8.. the refrigeration industry (microfin tubes in residential cooling, heat pumps) (García-Cascales et al, 2017;Illán-Gómez et al, 2017) and 9. the cryogenic industry (heat exchangers for hydrogen production systems) (Zhou et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Channel Blockage and Flow Maldistribution during Unsteady Flow in a Model Microchannel Plate heat Exchanger

Dąbrowski

Klugmann

Mikielewicz

2019

JAFM

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This paper describes the problem of channel blockage as a result of flow maldistribution between the channels of a model mini channel plate heat exchanger consisting of one pass on each leg. Each leg of the heat exchanger contains 51 parallel and rectangular minichannels of four hydraulic diameters namely 461 µm, 571 µm, 750 µm and 823 µm. In addition, a more complex geometry has been investigated where for the sake of breaking the development length the inclined transverse cuts have been incorporated. The moment of liquid phase transition through the exchanger (the working medium: water) was recorded for the mass fluxes ranging from 18.67 to 277.76 kg/m2s in 51 parallel channels with the use of a fast speed camera. The Reynolds numbers Re in the individual channels were from 10.76 to 90.04. The relationship between the mass flux and the size of the minichannels in the presence of the maldistribution is discussed here. The existence of the threshold in the mass flux below which the phenomenon occurs has been shown. Two mechanisms of channel blocking have been recorded and described in detail. A miniscale variation of one of them containing the extended geometry was created as well.

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“…In paper [21], the successive evaporation and condensation of water-ethanol and water-methanol liquid film mixtures for cooling purpose was investigated. The simulations were achieved using a finite difference model to describe the heat and mass transfer during this process.…”

Section: Introductionmentioning

confidence: 99%

An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe minichannels

et al. 2018

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This article presents the results of experimental research of heat transfer coefficient in air cooled vertical pipe minichannels during R404A, R407C and R410A high-pressure refrigerants condensation. The study determined local and average heat transfer coefficient values in full range of vapour quality, x = 0 ÷ 1. On the basis of experimental investigations, the dependence of heat transfer on the vapour quality x, mass flux density G and minichannel's internal diameter dw was obtained.

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New cooling approach using successive evaporation and condensation of a liquid film inside a vertical mini-channel

Cited by 19 publications

References 45 publications

Mitigation of Flow Maldistribution in Minichannel and Minigap Heat Exchangers by Introducing Threshold in Manifolds

Mitigation of Flow Maldistribution in Minichannel and Minigap Heat Exchangers by Introducing Threshold in Manifolds

Channel Blockage and Flow Maldistribution during Unsteady Flow in a Model Microchannel Plate heat Exchanger

An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe minichannels

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