Heat transfer and pressure drop characteristics of R134a flow boiling in the parallel/tandem microchannel heat sinks

Zhang, Yaxian; Wang, Jingtao; Liu, Wei; Liu, Zhichun

doi:10.1016/j.enconman.2017.06.067

Cited by 30 publications

(8 citation statements)

References 30 publications

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“…Unlike single-phase cooling, two-phase flow and heat transfer involve some specific concepts, including the mass flow rate of the two phases, the two-phase interfacial friction factor, the CHF, flow instability, the onset of nucleate boiling and dryness [120][121][122][123][124]. Li et al [125] performed saturated boiling experiments using water and studied the effect of surface wettability on the high aspect ratio microchannel.…”

Section: Gas-liquid Phase Changementioning

confidence: 99%

A comprehensive review on microchannel heat sinks for electronics cooling

Yu,

Li,

Cao

2024

Int. J. Extrem. Manuf.

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The heat dissipation density of electronic devices is increasing dramatically, which causes a serious heat bottleneck in electronics. Operating temperature over its rated temperature results in performance deterioration and even device damage. With the development of micro-machining technologies, microchannel heat sinks have become one of the best ways to remove the considerable amount of heat generated by the high-power electronics. It shows the advantages of large specific surface area, small size, saving coolant and high heat transfer coefficient. This paper comprehensively overviews the research progress in microchannel heat sinks and generalizes the hotspots and bottlenecks of this area. The heat transfer mechanisms and performances of different channel structures, coolants, channel materials and some other influence factors are reviewed. Besides, this paper classifies the heat transfer enhancement technology and reviews the related studies on both the single-phase and phase-change flow and heat transfer. The comprehensive review is expected to provide theoretical reference and technical guidance for further research and application of microchannel heat sinks in the future.

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Section: Gas-liquid Phase Changementioning

confidence: 99%

A comprehensive review on microchannel heat sinks for electronics cooling

Yu,

Li,

Cao

2024

Int. J. Extrem. Manuf.

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“…Donde (h) representa el coeficiente de transferencia de calor por convección, (A S ) al área superficial, (T S ) la temperatura de la superficie y (T ∞ ) la temperatura del fluido a cierta distancia de la superficie. Se debe considerar que la temperatura del fluido es igual a la de la superficie del sólido en la zona de contacto [16]. Al hablar de convección es importante clasificarla en dos tipos: natural o libre y forzada.…”

Section: Figura 4 Red De Resistencias Térmicas En Un Colector Solarunclassified

Análisis numérico de un sistema de calentamiento de agua utilizando un colector solar de placa plana

et al. 2020

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El objetivo de la presente investigación fue realizar un análisis numérico mediante CFD de un colector solar de placa plana; además, se realizó una comparación con resultados experimentales. El fluido de trabajo alcanzó una temperatura máxima de salida de 20.16 °C a las 12:00, el valor de la radiación solar se determinó para las coordenadas geográficas latitud –0.2252 y longitud –77.84; de forma similar, en este horario fue posible obtener una temperatura de la superficie del colector de 27.12 °C, como valor pico. Se determinó el menor rendimiento del dispositivo de transferencia de calor a las 10:00 con un valor de temperatura de salida del agua y temperatura máxima en la superficie del colector de 18.65 y 20.48 °C, respectivamente. Los resultados experimentales mostraron una temperatura máxima de 20.93 °C y una temperatura mínima de19.4 °C, derivando en un error de 4.01 % entre la simulación computacional y los datos experimentales.

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“…Heat exchangers involving two-phase flow condensation are widely utilized in numerous industries, such as nuclear, food processing, refrigeration, air conditioning, etc [1][2][3][4][5][6] . During the last years, compact heat exchangers (mini/micro channels) have attracted special attention, since they provide much higher energy efficiency, require lower amounts of refrigerant, and take up less space compared to conventional ones [7][8][9] . However, the enhanced flow area per mass velocity in these channels leads to higher pressure drop, which is followed by several negative impacts on the system 10 .…”

Section: Introductionmentioning

confidence: 99%

Two-phase Flow Condensation Inside Smooth Channels of Various Sizes: Universal Smart Models to Estimate the Frictional Pressure Drop

Moradkhani,

Hosseini,

Song

et al. 2024

Preprint

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Reliable and comprehensive predictive tools for the frictional pressure drop (FPD) are of particular importance for systems involving two-phase flow condensation. However, the available models are only applicable to specific operating conditions and channel sizes. Thus, this study aims at developing universal models to estimate the FPD during condensation inside smooth mini/micro and conventional (macro) channels. An extensive databank, comprising 8037 experimental samples and 23 working fluids from 50 reliable sources, was prepared to achieve this target. A comprehensive investigation on the literature models reflected the fact that all of them are associated with high deviations, and their average absolute relative errors (AAREs) exceed 26%. Hence, after identifying the most effective input variables through the Spearman's correlation analysis, three soft-computing paradigms, i.e., multilayer perceptron (MLP), gaussian process regression (GPR) and radial basis function (RBF) were employed to establish intelligent and dimensionless models for the FPD based on the Chisholm's theory. Among them, the most accurate results were presented by the GPR approach with AARE and \({R}^{2}\) values of 4.10%, 99.23% respectively, in the testing step. The truthfulness and applicability of the models were explored through an array of statistical and visual analyses, and the results affirmed the obvious superiority of the newly proposed approaches over the literature correlations. Furthermore, the novel predictive tools excellently described the physical variations of the condensation FPD versus the operating parameters. Ultimately, the order of importance of factors in controlling the condensation FPD was clarified by a sensitivity analysis.

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Heat transfer and pressure drop characteristics of R134a flow boiling in the parallel/tandem microchannel heat sinks

Cited by 30 publications

References 30 publications

A comprehensive review on microchannel heat sinks for electronics cooling

A comprehensive review on microchannel heat sinks for electronics cooling

Análisis numérico de un sistema de calentamiento de agua utilizando un colector solar de placa plana

Two-phase Flow Condensation Inside Smooth Channels of Various Sizes: Universal Smart Models to Estimate the Frictional Pressure Drop

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