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学术预告-Optimization of Heat Transfer Design in Convective Flow Boiling Phenomena:A case of Critical Heat Flux in Round Tubes

发布时间: 2019-06-13 16:09:00   作者:本站编辑   来源: 本站原创   浏览次数:

讲座主题:Optimization of Heat Transfer Design in Convective Flow Boiling Phenomena:A case of Critical Heat Flux in Round Tubes

专家姓名: William Jaewoo Shim (沈載祐)

工作单位: Dankook University

讲座时间:2019年6月17日上午10:00

讲座地点:化学馆东320

主办单位:烟台大学化学化工学院

内容摘要:

    An optimization of heat transfer design problem is presented in the realm of convective boiling phenomena. In the world of heat transfer design problems it now quite well-known that CHF (Critical Heat Flux) is the most efficient and critical heat transfer condition that designers seek. This study shows a method of predicting CHF (Critical Heat Flux) in vertical round tubes that have both uniform and cosine or non-uniform heat flux distributions. Initially a uniform correlation, based on local condition hypothesis, was developed from 9,366 CHF data points of uniform heat flux of water flowing in vertical upward tubes. The CHF database collected from 13 different sources had the following wide parameter ranges: 1.01 < P (pressure) < 206.79 bar, 9.92 < G (mass flux) < 18,619.39 kg/m2s, 0.00102 < D (diameter) < 0.04468 m, 0.0254 < L (length) < 4.966 m, 0.11 < qc (CHF) < 21.42 MW/m2, and –0.87 < X (exit qualities) < 1.58. The uniform CHF correlation that is developed can be utilized to provide a platform to predict CHF accurately in a non‐uniform heat flux heater for wide flow conditions. Furthermore, the location, where CHF occurs in non‐uniform heat flux distribution, can also be determined relatively accurate with the local variables: the system pressure (P), tube diameter (D), mass flux of water (G), and true mass flux of vapor (GXt). The new correlation predicted CHF in tubes of cosine heat flux (a non-uniform heat flux distribution), which consisted 297 data points from 5 different published sources, within the root mean square error of 12.42% and average error of 1.06% using the heat balance method.

主讲人介绍:

    William Jaewoo Shim (沈載祐), professor, associate vice president of international affairs office and professor at the department of chemical engineering in Dankook University, technical advisor at defense technology and quality department in Korea, University rules and regulations committee–member (2008–2011, 2017-Present), University management committee–member (2008–2011, 2017-Present) and visiting professor at department of chemical & biochemical engineering in Rutgers.

Journal Publication:

H.W. Chung and W.J. Shim, Calculation of Boil-off Gas (BOG) Generation of KC-1 Membrane LNG Tank with High Density Rigid Polyurethane Form by Numerical Analysis, Polish Maritime Research, Vol. 24, no.1, 2017

W.J. Shim et al., A Study of Automatic Control of Microbrewery System, Journal of Advanced Science & Technology, Vol. 4, no. 1, 2008

W.J. Shim et al., Analysis of CHF in Uniformly Heated Vertical Tubes for R-113, Journal of Advanced Science & Technology, Vol. 4, no. 1, 2008

W.J. Shim and J.Y. Park, Prediction of CHF in Vertical Round Tubes with Uniform Heat Flux for Water, Journal of Industrial and Engineering Chemistry, Vol. 12, no.1, 2006


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