Experimental study of flow boiling in a hybrid microchannel-microgap heat sink

Mathew, John; Lee, Poh Seng; Wu, Tianqing; Yap, Cheng‐Hon

doi:10.1016/j.ijheatmasstransfer.2019.02.033

Cited by 67 publications

(5 citation statements)

References 51 publications

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“…The uncertainties of derived parameters involving the effective heat flux, average saturated boiling heat transfer coefficient, local heat transfer coefficient and ultrasound enhancement ratio are determined by principle of error transfer in ref. [12] , [47] , [48] .…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Experimental investigation of flow boiling heat transfer enhancement under ultrasound fields in a minichannel heat sink

Fan

Luo

et al. 2021

Ultrasonics Sonochemistry

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Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Experimental investigation of flow boiling heat transfer enhancement under ultrasound fields in a minichannel heat sink

Fan

Luo

et al. 2021

Ultrasonics Sonochemistry

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“…Stable flow boiling is also one of the best way to enhance the heat transfer in the MCHS. The experimental analysis done by John Mathew et al [92] on the copper hybrid MCHS with flow boiling revealed that the local heat transfer coefficient is consistent increases with the heat flux and becomes sensitive to the heat flux. The pressure loss was also found to increase in the 2-phase flow with heat flux under all mass flow rate conditions.…”

Section: Flow Boiling In Mchsmentioning

confidence: 99%

“…Figure 24.Variation of upstream HT coefficient in the microchannel with respect to the heat flux with the images of flow visualization[92].…”

mentioning

confidence: 99%

Recent Advancements in Thermal Performance Enhancement in Microchannel Heatsinks for Electronic Cooling Application

Korasikha¹,

Sharma²,

Rao³

et al. 2021

Heat Transfer - Design, Experimentation and Applications

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Thermal management of electronic equipment is the primary concern in the electronic industry. Miniaturization and high power density of modern electronic components in the energy systems and electronic devices with high power density demanded compact heat exchangers with large heat dissipating capacity. Microchannel heat sinks (MCHS) are the most suitable heat exchanging devices for electronic cooling applications with high compactness. The heat transfer enhancement of the microchannel heat sinks (MCHS) is the most focused research area. Huge research has been done on the thermal and hydraulic performance enhancement of the microchannel heat sinks. This chapter’s focus is on advanced heat transfer enhancement methods used in the recent studies for the MCHS. The present chapter gives information about the performance enhancement MCHS with geometry modifications, Jet impingement, Phase changing materials (PCM), Nanofluids as a working fluid, Flow boiling, slug flow, and magneto-hydrodynamics (MHD).

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“…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%

“…To the best of the author's knowledge, such a solution has not been discussed yet. Moreover, there are few investigations concentrated on non-uniformity in minigaps or which compare minigaps with minichannels (Alam et al 2013;Mathew et al 2019). Therefore, there is a need for in-depth study to take a closer look at fluid flow in minigap sections, to investigate the influence of manifolds' geometry on flow maldistribution and to compare minigaps with minichannels.…”

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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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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Experimental study of flow boiling in a hybrid microchannel-microgap heat sink

Cited by 67 publications

References 51 publications

Experimental investigation of flow boiling heat transfer enhancement under ultrasound fields in a minichannel heat sink

Experimental investigation of flow boiling heat transfer enhancement under ultrasound fields in a minichannel heat sink

Recent Advancements in Thermal Performance Enhancement in Microchannel Heatsinks for Electronic Cooling Application

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

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