Abstract

Nonuniform performance of the parallel channels of the microchannel heat sink is one of the major limitations aggravating many undesired influences in both the single phase and the two phase heat transfer in microchannel heat sink. The nonuniform performance of the channels is preliminarily governed by the nonuniformity of the mass flow rate and heat flux transferred from the interface of parallel microchannels. The poor heat transfer (adiabatic/natural convection) boundary condition is primarily responsible for heat flux nonuniformity. In the current study a novel design of parallel microchannels heat sink is proposed, which is obtained by decreasing nonuniformity of mass flow rate and heat transfer existing between parallel channels of the microchannel heat sink. The nonuniformity of the mass flow rate is removed by the existing variable width approach and heat transfer nonuniformity among parallel channels is solved by the newly developed slanted microchannel provision. Developed design normalizes flow nonuniformity by 95.5% and heat transfer nonuniformity by 97.5% in comparison to the conventional design microchannel heat sink. The two major benefits offered by the proposed design are cooled (4.2 K lower than the conventional design) and uniform (3.1 K lesser than the conventional design) base surface temperature. It is also found that proposed work even facilitated in reduction of average base temperature (1.3 K lower than the conventional design). The maximum improvement in Nusselt number is 4.07%, also the proposed design extends benefits at off-design conditions even.

中文翻译：

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同时消除微通道散热器平行通道中的传热和质量流率不均匀性

摘要

微通道散热器的平行通道的不均匀性能是主要的局限之一，加剧了微通道散热器的单相和两相传热中的许多不良影响。通道的不均匀性能初步由质量流量和从平行微通道的界面传递的热通量的不均匀所决定。不良的传热（绝热/自然对流）边界条件是造成热通量不均匀的主要原因。在当前的研究中，提出了一种新颖的平行微通道散热器的设计，该设计是通过减少质量流量的不均匀性以及微通道散热器的平行通道之间存在的热传递来实现的。通过现有的可变宽度方法消除了质量流量的不均匀性，并通过新开发的倾斜微通道装置解决了平行通道之间的传热不均匀性。与常规设计的微通道散热器相比，开发的设计可将流量不均匀性标准化95.5％，将传热不均匀性标准化97.5％。提议的设计提供的两个主要优点是冷却（比常规设计低4.2 K）和均匀（比常规设计小3.1 K）的基础表面温度。还发现拟议的工作甚至有助于降低平均基础温度（比常规设计低1.3 K）。Nusselt数的最大改进为4.07％，即使在非设计条件下，所提出的设计也可以扩展益处。