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Keng-Hsien Wu

Bio: Keng-Hsien Wu is an academic researcher from Tatung University. The author has contributed to research in topics: Frost. The author has an hindex of 1, co-authored 1 publications receiving 46 citations.
Topics: Frost

Papers
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Journal ArticleDOI
TL;DR: In this paper, a microscopic image system is used to record the pattern and thickness of the frost layer per five seconds after the onset of formation, and a multiple-step ascending frost growth pattern caused by melting of frost crystals at the frost surface is observed.
Abstract: The present study is conducted to investigate the frost formation on a cold plate in atmospheric air flow by means of experimental and theoretical methods. In order to provide observations for the early stage of the frost growth process, a microscopic image system is used to record the pattern and the thickness of the frost layer per five seconds after the onset of frost formation. In this study, a multiple-step ascending frost growth pattern caused by melting of frost crystals at the frost surface has been observed. Effects of velocity, temperature and relative humidity of air (V, T a , and Φ) are studied, and the surface temperature of the cold plate (T w ) is also varied. The considered ranges of these dominant variables are: 2≤V≤13 m/s, 20≤T a ≤35°C, 40 percent≤Φ≤80 percent, and -13≤T w ≤-2°C. The theoretical model presented by Cheng and Cheng [22] for predicting the frost growth rate during the frost layer growth period is verified. Results show that the predictions of frost growth rate by the model agree with the experiment data, especially for the frost layer growth period.

54 citations


Cited by
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Journal ArticleDOI
TL;DR: A review and a comparative analysis of the available literature on frosting characteristics, correlations, and mathematical models are presented in this paper, where the mechanisms of the frost formation process and its influence are introduced, followed by the presentation of methods for the measurement of frost layer thickness and the frosting rate.

107 citations

Journal ArticleDOI
TL;DR: This survey, although extensive cannot include every paper; some selection is necessary, is intended to encompass the English language heat transfer papers published in 2003, including some translations of foreign language papers.

106 citations

Journal ArticleDOI
Max Kandula1
TL;DR: In this paper, an improved representation of frost density and effective thermal conductivity applicable to a wide range of frost circumstances have been incorporated, and the validity of the proposed model considering heat and mass diffusion in the frost layer is tested by a comparison of the predictions with data from various investigators for frost parameters including frost thickness, frost surface temperature, frost density, and heat flux.

103 citations

Journal ArticleDOI
TL;DR: In this article, the properties of growing frost layer were analyzed and compared for surfaces of different wettability to determine the effect that the surface energy has on the frost mass, thickness, and density.

52 citations

Journal ArticleDOI
M. Kandula1
TL;DR: In this article, a flat plate test specimen is made of aluminum-6031, and has dimensions of 0.3 m × 6.35mm, and the results for the first variable humidity case are obtained for a plate temperature of 255.4 k, air velocity of 1.77 m/s, air temperature of 295 k, and a relative humidity continuously ranging from 81 to 54 k.

48 citations