On the prediction of pressure drop in subcooled flow boiling of water
TL;DR: In this article, a systematic review of the performance of the prior correlations and their applicability for different conditions based on a large experimental database compiled from 12 sources containing 1365 data points in total, focussing on water as the working fluid.
About: This article is published in Applied Thermal Engineering.The article was published on 2019-06-05. It has received 8 citations till now. The article focuses on the topics: Critical heat flux & Heat transfer coefficient.
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TL;DR: In this paper, the authors presented the results of an experimental investigation into the water boiling heat transfer in a minichannel conduit vertically oriented with the upward flow, and the authors used a flow pattern map with the vapor quality as the abscissa versus the mass velocity as the ordinate.
31 citations
TL;DR: In this paper, the two-phase pressure drop in a one-sided high-heat-loaded screw tube was analyzed under subcooled flow boiling conditions, and the results were underpredicted for high heat-flux conditions.
Abstract: In this study, the two-phase pressure drop in a one-sided high-heat-loaded screw tube was analyzed under subcooled flow boiling conditions. When the loaded heat flux is gradually increased under one-sided heating conditions, although the pressure drop changes slightly in the single phase, it starts to increase when loading above the onset of significant void (OSV) heat flux. The effect of system parameters on the two-phase pressure drop in relation to the change of heat transfer mechanism or fluid properties was analyzed according to each variable change. In addition, this study evaluated the prediction performance of existing two-phase pressure drop multiplier correlations developed under subcooled flow boiling conditions. Because most existing correlations are based on a smooth channel with a small diameter, they tend to overpredict the experimental values. The correlation proposed by Ramesh showed the lowest average error rate (31.94%); however, the results were underpredicted for high-heat-flux conditions. To obtain more accurate results, we developed a Python code using an artificial intelligence regression method to proceed with the optimization process based on the experimental values. Using this code, we developed a novel two-phase pressure drop multiplier correlation for a one-side-heated screw tube that can be used in fusion divertors under high-heat-load conditions.
12 citations
TL;DR: In this article, an experimental study on the R-134a subcooled flow boiling stemming from oscillatory heat flux in narrow annuli oriented horizontally with focus on heat transfer characteristics was conducted.
5 citations
TL;DR: In this article, the subcooled boiling pressure drop is obtained from an experiment in a narrow rectangular channel (2.3mm × 67mm) under downward flow with low heat flux, mass flux and pressure.
3 citations
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TL;DR: This paper explores the recent research developments in high-heat-flux thermal management and demonstrates that, while different cooling options can be tailored to the specific needs of individual applications, system considerations always play a paramount role in determining the most suitable cooling scheme.
Abstract: This paper explores the recent research developments in high-heat-flux thermal management. Cooling schemes such as pool boiling, detachable heat sinks, channel flow boiling, microchannel and mini-channel heat sinks, jet-impingement, and sprays, are discussed and compared relative to heat dissipation potential, reliability, and packaging concerns. It is demonstrated that, while different cooling options can be tailored to the specific needs of individual applications, system considerations always play a paramount role in determining the most suitable cooling scheme. It is also shown that extensive fundamental electronic cooling knowledge has been amassed over the past two decades. Yet there is now a growing need for hardware innovations rather than perturbations to those fundamental studies. An example of these innovations is the cooling of military avionics, where research findings from the electronic cooling literature have made possible the development of a new generation of cooling hardware which promise order of magnitude increases in heat dissipation compared to today's cutting edge avionics cooling schemes.
824 citations
TL;DR: In this paper, a closed form equation has been proposed to present these solutions for the circular tube, parallel plates, rectangular, equilateral triangular, and concentric annular ducts.
Abstract: Laminar hydrodynamic entry length solutions for circular and noncircular ducts are essential in proper design of compact heat exchangers and other heat transfer and fluid flow devices. A closed form equation has been proposed to present these solutions for the circular tube, parallel plates, rectangular, equilateral triangular, and concentric annular ducts. The necessary constants are evaluated and it is shown that the proposed correlation predicts the apparent friction factors within ± 2.4 percent.
207 citations
01 May 1951
TL;DR: In this paper, a descriptive summary of Heat Transfer, Burnout, Pressure Drop and Density Date for High Pressure Water is presented, along with an analysis of heat transfer, burnout, pressure drop and density date.
Abstract: This report is the descriptive summary Analysis of Heat Transfer, Burnout, Pressure Drop and Density Date for High Pressure Water.
163 citations
TL;DR: In this article, the effects of five parameters (mass flux, inlet temperature, exit pressure, tube internal diameter, and length-to-diameter ratio) on both single and two-phase pressure drop were studied and evaluated.
79 citations
TL;DR: In this article, numerical simulations were performed using Fluent 14.5 to investigate single phase flow and conjugate heat transfer in copper rectangular microchannels in 3D thin-wall models.
73 citations