An investigation of horizontal and vertical flow boiling in a single channel with a confinement number beyond the threshold of micro-scale flow

2021 ◽  
Vol 33 (11) ◽  
pp. 113302
Author(s):  
Sira Saisorn ◽  
Adirek Suriyawong ◽  
Pochai Srithumkhant ◽  
Pakorn Wongpromma ◽  
Somchai Wongwises
Keyword(s):  
Single Channel ◽  
Flow Boiling ◽  
Vertical Flow ◽  
Micro Scale

CRITICAL HEAT FLUX ON LASER-TEXTURED SURFACE IN VERTICAL FLOW BOILING

2018 ◽  
Author(s):  
Joseph L. Bottini ◽  
Vineet Kumar ◽  
Sabrina Hammouti ◽  
David Ruzic ◽  
Caleb S. Brooks
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Flow Boiling ◽  
Textured Surface ◽  
Vertical Flow

Boiling Flow Interaction Between Two Parallel Microchannels

2006 ◽  
Author(s):  
Roger D. Flynn ◽  
David W. Fogg ◽  
Jae-Mo Koo ◽  
Ching-Hsiang Cheng ◽  
Kenneth E. Goodson
Keyword(s):  
Heat Transfer ◽  
Liquid Flow ◽  
Heat Exchangers ◽  
Single Channel ◽  
Flow Boiling ◽  
Parallel Channel ◽  
Flow Interaction ◽  
Boiling Flow ◽  
Parallel Microchannels ◽  
Channel Configuration

Microchannel heat exchangers predominately use a parallel channel configuration to maximize heat transfer with minimal pump demand. Previous work optimized bulk performance of liquid flow heat exchangers but noted that upon boiling, flow redistributed among parallel channels, and they ultimately found that this instability caused an uncontrollable operating condition. This work predicts and measures fully coupled boiling flow interaction in a simplified two microchannel system. A series of silicon microfabricated devices enable piecewise study of the coupled fluidic and heat transfer interactions, first uniting the fluid inlets of thermally isolated channels, then connecting neighboring channel walls to allow heat transfer between channels. Multiple combinations of boiling and liquid flow, each satisfying system boundary conditions, are identified using flow demand curves assembled from single channel data. Each unique flow condition is experimentally demonstrated and found to be heavily dependent on the prior state of the channels. Connecting channel walls, thermally, is shown to lessen the number of allowed solutions and increase instability in the two channel system, allowing distinction between purely fluidic instabilities and fluidic instabilities coupled to heat transfer between channels. This work in describing interaction between two channels is a necessary step as work continues toward characterizing flow boiling in more complex parallel channel heat sinks.

Review: General Issues and Correlations for Predicting Flow Boiling Heat Transfer Coefficients in Micro-Scale Channels

2015 ◽  
Vol 23 (04) ◽  
pp. 1530003 ◽  
Author(s):  
Chang Yong Park
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Inertial Force ◽  
Viscous Force ◽  
Vapor Quality ◽  
Micro Scale ◽  
Continuous Decrease ◽  
Flow Boiling Heat Transfer

A review study was performed for basic heat transfer mechanism and quantitative analysis of correlations for flow boiling heat transfer in micro-scale channels. Several criteria for determining threshold diameter for micro-scale channels were discussed and the concept of confinement number was commented. The distinctive feature of flow boiling in micro-scale channels were considered and it was found out that the effect of the heat flux, latent heat, viscous force, surface tension, and inertial force was more significant. Important dimensionless parameters were summarized and it was pointed out that the boiling number, capillary number, and Weber number could be expected to play important roles at flow boiling in micro-scale channels. 17 correlations for flow boiling in micro-scale channels were reviewed in this study, and they were categorized by three types of correlations such as an equivalent Nusselt number correlation, a correlation with superposition of nucleate and convection boiling mechanism, and a flow pattern-based correlation. The predicted values by the correlations were compared with 536 experimental data from four different literatures and a correlation with smallest prediction errors was found. Some correlations showed distinct trends of convection heat transfer coefficient (h) change with respect to the variation of vapor quality. The trends are categorized by three trends such as noticeable increase of h with the increase of vapor quality and significant continuous decrease after dryout point, minor increase and decrease or decrease and increase of h, and gradual and continuous decrease of h with the increase of vapor quality. For each trend of h change, recommendable correlations and their basic equation forms were proposed to compare the prediction results with experimental data or to develop a new correlation by modifying existing correlations.

Flow boiling in micro-scale channels – Synthesized literature review

2013 ◽  
Vol 36 (2) ◽  
pp. 301-324 ◽  
Author(s):  
Cristiano Bigonha Tibiriçá ◽  
Gherhardt Ribatski
Keyword(s):  
Literature Review ◽  
Flow Boiling ◽  
Micro Scale
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