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M.W. Wambsganss

Bio: M.W. Wambsganss is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Two-phase flow & Pressure drop. The author has an hindex of 17, co-authored 48 publications receiving 2195 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a small circular channel (d = 2.46) and a small rectangular channel with Refrigerant 12.5 was used to study the effects of channel geometry and fluid properties on heat transfer.

545 citations

Journal ArticleDOI
TL;DR: In this paper, two-phase pressure drop, boiling heat transfer, and critical heat flux to water were studied in a small horizontal tube of 2.98mm inside diameter and 0.91m heated length.

373 citations

Journal ArticleDOI
TL;DR: In this article, two-phase flow pressure drop measurements were made during a phase-change heat transfer process with three refrigerants (R-134a, R-12, and R-113) at six different pressures ranging from 138 to 856 kPa.

282 citations

Journal ArticleDOI
TL;DR: In this article, a study on boiling heat transfer of refrigerant R-113 in a small-diameter (2.92 mm) tube is reported, where local heat transfer coefficients are measured for a range of heat flux (8.8-90.75 kW/m[sup 2]), mass flux (50-300 kg/m [sup 2]s), and equilibrium mass quality (0-0.9).
Abstract: Results of a study on boiling heat transfer of refrigerant R-113 in a small-diameter (2.92 mm) tube are reported. Local heat transfer coefficients are measured for a range of heat flux (8.8-90.75 kW/m[sup 2]), mass flux (50-300 kg/m[sup 2]s), and equilibrium mass quality (0-0.9). The measured coefficients are used to evaluate 10 different heat transfer correlations, some of which have been developed specifically for refrigerants. High heat fluxes and low mass fluxes are inherent in small channels, and this combination results in high boiling numbers. In addition, based on a flow pattern map developed from adiabatic experiments with air-water mixtures, it has been shown that small-diameter channels produce a slug flow pattern over a large range of parameters when compared with larger-diameter channels. The effects of high boiling number and slug flow pattern lead to domination by a nucleation mechanism. As a result, the two-phase correlations that predicted this dominance also predicted the data the best when they properly modeled the physical parameters. The correlation of Lazarek and Black (1982) predicted the data very well. It is also shown that a simple form, suggested by Stephan and Abdelsalam (1980) for nucleate pool boiling, correlates the data equally well; both correlationsmore » are within a mean deviation of less than 13 percent. Results are applicable to boiling in compact heat exchangers. 28 refs., 11 figs., 3 tabs.« less

254 citations


Cited by
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Journal ArticleDOI
TL;DR: It has been found nan ofluids have a much higher and strongly temperature-dependent thermal conductivity at very low particle concentrations than conventional fluids, which can be considered as one of the key parameters for enhanced performances for many of the applications of nanofluids.
Abstract: Nanofluids are potential heat transfer fluids with enhanced thermophysical properties and heat transfer performance can be applied in many devices for better performances (i.e. energy, heat transfer and other performances). In this paper, a comprehensive literature on the applications and challenges of nanofluids have been compiled and reviewed. Latest up to date literatures on the applications and challenges in terms of PhD and Master thesis, journal articles, conference proceedings, reports and web materials have been reviewed and reported. Recent researches have indicated that substitution of conventional coolants by nanofluids appears promising. Specific application of nanofluids in engine cooling, solar water heating, cooling of electronics, cooling of transformer oil, improving diesel generator efficiency, cooling of heat exchanging devices, improving heat transfer efficiency of chillers, domestic refrigerator-freezers, cooling in machining, in nuclear reactor and defense and space have been reviewed and presented. Authors also critically analyzed some of the applications and identified research gaps for further research. Moreover, challenges and future directions of applications of nanofluids have been reviewed and presented in this paper. Based on results available in the literatures, it has been found nanofluids have a much higher and strongly temperature-dependent thermal conductivity at very low particle concentrations than conventional fluids. This can be considered as one of the key parameters for enhanced performances for many of the applications of nanofluids. Because of its superior thermal performances, latest up to date literatures on this property have been summarized and presented in this paper as well. However, few barriers and challenges that have been identified in this review must be addressed carefully before it can be fully implemented in the industrial applications.

1,558 citations

Journal ArticleDOI
TL;DR: In this article, the effects of the channel size on the flow patterns and heat transfer and pressure drop performance are reviewed in small hydraulic diameter channels, and the fundamental questions related to the presence of nucleate boiling and characteristics of flow boiling in microchannels and minichannels in comparison to that in the conventional channel sizes (3 mm and above) are addressed.

840 citations

01 Jan 2002
TL;DR: In this article, the effects of the channel size on the flow patterns and heat transfer and pressure drop performance are reviewed in small hydraulic diameter channels, and the fundamental questions related to the presence of nucleate boiling and characteristics of flow boiling in microchannels and minichannels in comparison to that in the conventional channel sizes (3 mm and above) are addressed.
Abstract: Flow boiling in small hydraulic diameter channels is becoming increasingly important in many diverse applications. The previous studies addressing the effects of the channel size on the flow patterns, and heat transfer and pressure drop performance are reviewed in the present paper. The fundamental questions related to the presence of nucleate boiling and characteristics of flow boiling in microchannels and minichannels in comparison to that in the conventional channel sizes (3 mm and above) are addressed. Also, the effect of heat exchanger configuration—single-channel and multichannel—on the heat transfer and pressure drop performance is reviewed. The areas for future research are identified.

818 citations

Journal ArticleDOI
TL;DR: In this paper, the authors measured and predicted saturated flow boiling heat transfer in a water-cooled micro-channel heat sink and found that the dominant heat transfer mechanism is forced convective boiling corresponding to annular flow.

556 citations

Journal ArticleDOI
TL;DR: In this paper, a review of recent research on boiling in micro-channels is presented, which addresses the topics of macroscale versus micro-scale heat transfer, two-phase flow regimes, flow boiling heat transfer results for micro-channel, heat transfer mechanisms in microchannels and flow boiling models for micro channels.

553 citations