Experimental study on convective boiling of micro-pin-finned channels with parallel arrangement fins for FC-72 dielectric fluid

Chien, Liang-Han; Liao, Wun-Rong; Ghalambaz, Mohammad; Yan, Wei‐Mon

doi:10.1016/j.ijheatmasstransfer.2019.04.072

Cited by 24 publications

(4 citation statements)

References 30 publications

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“…For the alteration of microchannels walls or bottom surfaces, such as microchannels with different fin shapes, 15,[124][125][126][127][128][129][130][131][132] porous coatings, 133,134 surface wettability. 135 Lee et al 15 studied the impact of the fin height, spacing, and length on the flow boiling in a microchannel.…”

Section: Two-phase Flowmentioning

confidence: 99%

Research progress of the liquid cold plate cooling technology for server electronic chips: A review

Zhou

Dong

Sun

et al. 2022

Intl J of Energy Research

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A significant quantity of research has been dedicated to the application of liquid cold plates to eliminate the high heat flux in server electronic chips. Traditional parallel straight microchannel liquid cold plates suffer from low heat flux density with uneven flow distribution, which poses a serious challenge to high-performance server chip heat dissipation. This paper reviews recent research progress in geometry optimization, interrupted structures, channel patterns, and two-phase flow of liquid cold plates. The optimal geometry parameters of rectangular cross-sectional microchannels including the aspect ratio, length, and hydraulic diameter are summarized. Inquest of higher thermal performance, various interrupted structures (ribs, pin fins, etc.), special channel patterns (wavy-shaped, zigzag-shaped, fractal, serpentine, and doublelayered microchannels, etc.), and two-phase flow on the liquid cold plate are applied to promote fluid-turbulivity and increase heat transfer area, meanwhile they lead to more pressure drop. Furthermore, it is an essential approach to commercialize liquid cold plates by applying the academic and prototype of the liquid cold plate to manufacturing and liquid cooling system solutions. In the end, this review provides a discussion about the limitations of current research on liquid cold plates and an outlook on future research directions.

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Section: Two-phase Flowmentioning

confidence: 99%

Research progress of the liquid cold plate cooling technology for server electronic chips: A review

Zhou

Dong

Sun

et al. 2022

Intl J of Energy Research

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“…They observed heat transfer enhancement at the expense of higher pressure drop. Chien et al [32] and Liao et al [33] proposed square micro-pin-fins with pores and openings facing the downstream direction. A reduction in ONB superheat degree was achieved through the new microstructure.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flow and Heat Transfer Characteristics in Non-Closed Ring-Shaped Micro-Pin-Fin Arrays

Chen

Liu

et al. 2023

Energies

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In this study, flow and heat transfer characteristics in novel non-closed 3/4 ring-shaped micro-pin-fin arrays with in-line and staggered layouts were investigated numerically. The flow distribution, wake structure, vorticity field and pressure drop were examined in detail, and convective heat transfer features were explored. Results show that vortex pairs appeared earlier in the ring-shaped micro-pin-fin array compared with the traditional circular devices. Pressure drop across the microchannel varied with layout of the fins, while little difference in pressure drop was observed between ring-shaped and circular fins of the same layouts, with the maximum difference being 1.43%. The staggered ring-shaped array was found to outperform the in-line array and the circular arrays in convective heat transfer. A maximum increase of 21.34% in heat transfer coefficient was observed in the ring-shaped micro-pin-fin array in comparison with the circular micro-pin-fin array. The overall thermal-hydraulic performance of the microstructure was evaluated, and the staggered ring-shaped array with a fin height of 0.5 mm exhibited the best performance among the configurations studied.

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“…Pirouz et al [26] used the Lattice-Boltzmann method to examine the hydrothermal details of a baffled channel and they confirmed that this method is suitable for the study of such problems. Chien et al [27] experimentally conducted a convective boiling test inside micro-channels containing fins with a dielectric working fluid of the FC-72 type. As expected, the fluid passes both the high temperature and boiling phases as the pressure-drop increases across the channel, while its surface temperature-difference decreases significantly.…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Simulation and Analysis of Hydrothermal Aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

Salmi¹,

YounesMenni²,

Chamkha³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

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The hydrothermal behavior of air inside a solar channel heat exchanger equipped with various shaped ribs is analyzed numerically. The bottom wall of the exchanger is kept adiabatic, while a constant value of the temperature is set at the upper wall. The duct is equipped with a flat rectangular fin on the upper wall and an upstream V-shaped baffle on the lower wall. Furthermore, five hot wall-attached rib shapes are considered: trapezoidal, square, triangular pointing upstream (type I), triangular pointing downstream (type II), and equilateral-triangular (type III) cross sections. Effects of the flow rates are also inspected for various Reynolds numbers in the turbulent regime (1.2 × 10 4 -3.2 × 10 4 ). The highest performance (η) value is given for the II-triangular rib case in all Re values, while the square-shaped ribs show a significant decrease in the η along the achieved Re range. The η value at Re max is 2.567 for the II-triangular roughness case. Compared with the other simulated cases, this performance is decreased by about 3.768% in the case of I-triangular ribs, 15.249% in the case of III-triangular ribs, 20.802% in the case of trapezoidal ribs, while 27.541% in the case of square ribs, at the same Re max . Also, a comparison is made with air-heat exchangers that have non-rough walls and contain cross-shaped VGs presented previously, in order to highlight the effectiveness of the rough surface presence in the baffled and finned channels. The obtained results indicated that the triangular-shaped rib (type II) has the most significant hydrothermal behavior than the other cases. This indicates the necessity of roughness heat transfer surfaces for finned and baffled channels to improve significantly the performance of the air-heat exchangers they contain.

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Experimental study on convective boiling of micro-pin-finned channels with parallel arrangement fins for FC-72 dielectric fluid

Cited by 24 publications

References 30 publications

Research progress of the liquid cold plate cooling technology for server electronic chips: A review

Research progress of the liquid cold plate cooling technology for server electronic chips: A review

Numerical Simulation of Flow and Heat Transfer Characteristics in Non-Closed Ring-Shaped Micro-Pin-Fin Arrays

CFD-Based Simulation and Analysis of Hydrothermal Aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

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