Effects of Temperature and Relative Humidity of Air on Temperature Distributions and Local Heat Transfer Rate of Longitudinal Fins of Rectangular and Triangular Profiles under Partially Wet Surface Conditions
Article Sidebar
Main Article Content
Abstract
Fins are the most widely used surface that enhances the heat transfer performance of heat exchangers. When the temperature of fin surface is lower than the dew point temperature, the water vapor in the moist air will condense and adhere the fin surface. The fin surfaces are under partially wet surface conditions. There is simultaneous mass, sensible heat, and latent heat of vaporization. In this research, the effects of air temperature and relative humidity on the temperature distributions and local heat transfer rates of the longitudinal fins of rectangular and triangular profiles under partially wet surface conditions are presented. From the results of programming, it can see that when the temperature and relative humidity of air increase, the temperature and heat transfer rate of air increase too. Additionally, the proportion of wet surface also increase. However, for the rectangular and triangular profiles, when the relative humidity increases, the local heat transfer rate at fin tip area decreases.
Article Details
References
T.E. Schmidt, “Heat transfer calculations for extended surfaces”, Refrigeration Engineering, 49, 351–357, 1949.
D.Q. Kern, A.D. Kraus, “Extended surface heat transfer”, McGraw-Hill, Inc., New-York, NY, 1972.
C. Arslanturk, “A decomposition method for fin efficiency of convective straight fins with temperature-dependent thermal conductivity”, International Journal of Heat and Mass Transfer, 32, 831–841, 2005.
A.A. Joneidi, D.D. Ganji, M. Babaelahi, “Differential Transformation Method to determine fin efficiency of convective straight fins with temperature dependent thermal conductivity”, International Communications in Heat and Mass Transfer, 36, 757–762, 2009.
D.B. Kulkarni, M.M. Joglekar, “Residue minimization technique to analyze the efficiency of convective straight fins having temperature-dependent thermal conductivity”, Applied Mathematics and Computation, 215, 2184–2191, 2009.
J.L. Threlkeld, “Thermal environmental engineering”, Prentice-Hall, Inc., New-York, NY, 1970.
S.Y. Liang, T.N. Wong, G.K. Nathan, “Comparison of one-dimensional and two-dimensional models for wet-surface fin efficiency of a plate-fin-tube heat exchanger”, Applied Thermal Engineering, 20, 941-962, 2000.
W. Pirompugd, C.C. Wang, S. Wongwises, “Finite circular fin method for heat and mass transfer characteristics for plain fin-and-tube heat exchangers under fully and partially wet surface conditions”, International Journal Heat Mass Transfer, 50(3–4), 552–565, 2007.
W. Pirompugd, S. Wongwises, “Partiallly wet fin efficiency for the longitudinal fins of rectangular, triangular, concave parabolic, and convex parabolic profiles”, Journal of Franklin Institute, 350, 1424-1442, 2013.
W. Pirompugd, S. Wongwises, “Efficiencies for partially wetted spine fins: uniform cross section, conical, concave parabolic, and convex parabolic profiles”, Journal of Heat Transfer, 135(8), Article 081903, 2013.
W. Pirompugd, S. Wongwises, “Analytical methods for the efficiency of annular fins with rectangular and hyperbolic profiles under partially wet surface conditions”, Numerical Heat Transfer, Part A: Application, 80(12), 617-634, 2021.
P. Nimmy, K.V. Nagaraja, P. Srilatha, K. Karthik, G. Sowmya, R.S.V. Kumar, U. Khan, S.M. Hussain, A.S. Hendy, M.R. Ali, “Implication of radiation on the thermal behavior of a partially wetted dovetail fin using an artificial neural network”, Case Studies in Thermal Engineering, 51, 103552, 2023.
U. Milovancevic, S. Genic, B. Jacimovic, M. Otovic, “Wet cooling of air on plate finned tube heat exchangers”, International Journal of Refrigeration, 165, 133-144, 2024.
R.J. Myers, “The effect of dehumidification on the air-side heat transfer coefficient for a finned-tube coil”, Master thesis, University of Minnesota, Minneapolis, USA, 1967.