An Experimental Investigation on the Influence of Copper Ageing on Flow Boiling in a Copper Microchannel
TL;DR: In this paper, the influence of copper ageing on flow boiling heat transfer and pressure drop in copper microchannels of two different hydraulic diameters was investigated, and the experimental results showed that the influence was negligible.
Abstract: The study reports the experimental investigation on the influence of copper ageing on flow boiling heat transfer and pressure drop in copper microchannels of two different hydraulic diamete...
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TL;DR: In this paper, the influence of vapour venting on the flow boiling pressure drop and heat transfer of water in copper mini/micro-channels of three different aspect ratios was investigated.
18 citations
TL;DR: In this article, the aging behavior of an untreated and a laser-textured copper boiling surface during an eight-day testing period under pool boiling conditions using saturated water at atmospheric pressure was investigated.
14 citations
TL;DR: In this article, the significance of surface modification on the heat transport phenomena under nucleate pool boiling configuration of saturated R-141b at ambient condition over SiO2 thin film (TF) nanocoated surfaces was investigated.
14 citations
TL;DR: In this paper, a one-dimensional model is proposed to estimate the pressure drop and heat transfer coefficient for flow boiling in a rectangular microchannel, taking into account the pressure fluctuations caused due to the confined bubble growth and the effect of pressure fluctuations on the heat transfer characteristics.
12 citations
TL;DR: In this paper, heat sinks based on flow boiling in microchannels have the potential to mitigate temperature rise in high heat flux devices such as electronic equipment. But the major challenge is the instabil...
Abstract: Heat-sinks based on flow boiling in microchannels have the potential to mitigate temperature rise in high heat flux devices such as electronic equipment. One of the major challenges is the instabil...
9 citations
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TL;DR: In this paper, the second part of a two-part study concerning two-phase flow and heat transfer characteristics of R134a in a micro-channel heat sink incorporated as an evaporator in a refrigeration cycle is presented.
500 citations
TL;DR: In this article, the cumulative number density of the cavities and their shapes were determined with an optical microscope and the surface had a mirror finish and had a surface Ra (centerline average) value of less than 0.02 μm.
Abstract: Pool boiling of saturated water at 1 atm pressure has been investigated. In the experiments, copper surfaces prepared by following a well-defined procedure were used. The cumulative number density of the cavities and their shapes were determined with an optical microscope. The surface had a mirror finish and had a surface Ra (centerline average) value of less than 0.02 μm. The wettability of the surface was changed by controlling the degree of oxidation of the surface. In the experiments with the primary surface, the wall heat flux and superheat were determined with the help of thermocouples embedded in the test block. The density, spatial distribution, local distribution, and nearest-neighbor distance distribution of active nucleation sites in partial and fully developed nucleate boiling were determined from still pictures.
485 citations
TL;DR: In this article, the authors explored hydrodynamic instability and pressure drop in a water-cooled two-phase micro-channel heat sink containing 21 parallel 231 × 713 μm micro-channels.
472 citations
TL;DR: In this paper, a discussion of the possible applications of flow boiling in microchannels in order to highlight the challenges in the thermal management for each application is presented. But, several fundamental issues are still not understood and this hinders the transition from laboratory research to commercial applications.
325 citations
"An Experimental Investigation on th..." refers background in this paper
...In general, from the literature [6–8, 11, 12, 31–34] it can be seen that the channel hydraulic diameter considered for microchannel studies is less than 1mm, although there are disagreements with regard to the criteria for classification of channels as micro, mini, and macro (conventional size) channels [35]....
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TL;DR: In this paper, the fundamental heat transfer data and two-phase flow patterns present during flow boiling in microchannels were obtained and the measured single-phase, adiabatic pressure drop agreed with the conventional theory within the experimental error.
Abstract: Microchannels are being considered in many advanced heat transfer applications including automotive and stationary fuel cells as well as electronics cooling. However, there are a number of fundamental issues from the heat transfer and fluid mechanics perspectives that still remain unresolved. The present work focuses on obtaining the fundamental heat transfer data and two-phase flow patterns present during flow boiling in microchannels. An experimental investigation is performed for flow boiling using water in six parallel horizontal microchannels with a hydraulic diameter of 207 μm. The ranges of parameters are: mass flux from 157 to 1782 kg/m 2 s, heat flux from 5 to 930 kW/m 2 , inlet temperature of 22°C, quality from sub-cooled to 1.0. and atmospheric pressure at the exit. The corresponding single-phase, all-liquid flow Reynolds number range at the saturation conditions is from 116 to 1318. The measured single-phase, adiabatic pressure drop agreed with the conventional theory within the experimental error
268 citations