Experimental investigation of local flow boiling heat transfer and pressure drop characteristics in microgap channel

Alam, Tamanna; Lee, Poh Seng; Yap, Cheng‐Hon; Jin, Liwen

doi:10.1016/j.ijmultiphaseflow.2012.02.007

Cited by 87 publications

(31 citation statements)

References 13 publications

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“…Heat-loss characterization is carried out prior to experiments using the methodology employed by Alam et al [9]. Before each experiment session, degassing is carried out by boiling the de-ionized water in the reservoir for 2 hours.…”

Section: Methodsmentioning

confidence: 99%

Temperature Transients for Detection of Flow-regimes in a Mini/Microchannel

Jagirdar

Lee

2015

Energy Procedia

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Flow boiling in microchannel has been receiving a lot of attention in recent years because of its high heat flux removal capabilities at low flow rates and low pumping power. An important aspect of flow-boiling experiments is detection of the prevalent flow-regime. Currently, most researchers use high-speed camera for flow visualization for regime detection. However, in some cases due to limitations of the experimental setup and test-piece, such as multilayer cooling of 3D IC stack, this may not be feasible. We study the influence of flow-regime on amplitude-frequency domain of wetted surface temperature. Experiments have been performed along with high speed flow visualization on a single microchannel having dimensions of 25.4 x 2.54 x 0.4 mm 3 (l x b x h) with de-ionized water as the working fluid. Mass fluxes tested were 200 and 600 kg/(m 2 s). Within the bounds of current experimental parameters, we conclude that local transient temperature data can a potential diagnostic tool for detection of flow-regimes.

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Section: Methodsmentioning

confidence: 99%

Temperature Transients for Detection of Flow-regimes in a Mini/Microchannel

Jagirdar

Lee

2015

Energy Procedia

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“…More details of test loop, test section, test procedure, and calibration procedure are available in Alam et al [21,24].…”

Section: Tablementioning

confidence: 99%

“…2(c)) in the microgap as it corresponds to the highest degree of saturated boiling and there is a significant progression of heat transfer performance as move downstream [20]. Moreover, the temperature variations of test section in the lateral direction are negligible before dryout phase [21]. Error analyses have been conducted according to the principles proposed by Taylor [28] to compute the uncertainty in the experimental data of this work.…”

Section: Data Reduction and Uncertainty Analysismentioning

confidence: 99%

“…It is expected that a further reduction of flow boiling instability can be achieved by modifying straight microgap heat sink to expanding microgap due to reducing shear force along the direction of expansion as it contributes to easing flow in the direction of expansion. In recent years, a number of studies have attempted to better understand the flow boiling heat transfer and pressure drop mechanism in microgap [20][21][22][23][24][25][26]. Recently, we have reported the flow boiling heat transfer and pressure drop characteristics in expanding microgap heat sink [27].…”

Section: Introductionmentioning

confidence: 99%

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Flow boiling instability characteristics in expanding silicon microgap heat sink

Alam

Lee

2015

International Journal of Heat and Mass Transfer

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“…Two-phase flow and heat transfer in microgaps have received significant attention due to their ability to dissipate high heat fluxes and maintain small wall temperature gradients, while being less prone to flow instabilities than microchannel geometries [1][2][3][4][5][6][7][8]. Recent studies have shown increasing two-phase heat removal rates in microgaps with decreasing gap height, with thin film convective boiling being the dominant heat transfer mechanism [3][4].…”

Section: Introductionmentioning

confidence: 99%

Flow regimes and convective heat transfer of refrigerant flow boiling in ultra-small clearance microgaps

Nasr

Green

Kottke

et al. 2017

International Journal of Heat and Mass Transfer

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Understanding two-phase convective heat transfer under extreme conditions of high heat and mass fluxes and confined geometry is of fundamental interest and practical significance. In particular, next generation electronics are becoming thermally limited in performance, as integration levels increase due to the emergence of ‗hotspots' featuring up to ten-fold increase in local heat fluxes, resulting from non-uniform power distribution. An ultra-small clearance, 10 μm microgap, was investigated to gain insight into physics of high mass flux refrigerant R134a flow boiling, and to assess its utility as a practical solution for hotspot thermal management. Two configurations -a bare microgap, and inline micro-pin fin populated microgap -were tested in terms of their ability to dissipate heat fluxes approaching 1.5 kW/cm 2 . Extreme flow conditions were investigated, including mass fluxes up to 3,000 kg/m 2 s at inlet pressures up to 1.5MPa and 2 exit vapor qualities approaching unity. Dominant flow regimes were identified and correlated to two phase heat transfer coefficients obtained using model-based data reduction for both device configurations. The results obtained were compared to predictions using correlations from literature, with the maximum heat transfer coefficient reaching 1.5 MW/m 2 K in the vapor plume regime in the case of the finned microgap.

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Experimental investigation of local flow boiling heat transfer and pressure drop characteristics in microgap channel

Cited by 87 publications

References 13 publications

Temperature Transients for Detection of Flow-regimes in a Mini/Microchannel

Temperature Transients for Detection of Flow-regimes in a Mini/Microchannel

Flow boiling instability characteristics in expanding silicon microgap heat sink

Flow regimes and convective heat transfer of refrigerant flow boiling in ultra-small clearance microgaps

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