An analytical study of the effect of dehumidification of air on the performance and optimization of straight tapered fins

Optimum Fin Profile under Dry and Wet Surface Conditions

“…The condensation takes place when fin surface temperature is below the dew point of the surrounding air and for its calculation, specific humidity of the saturated air on the wet surface is assumed to be a linear function with the local fin temperature. This assumption can be considered due to the smaller temperature range involved in the practical application between fin base and dew point temperatures and within this small range, saturation curve on the psychometric chart is possible to be an approximated by a straight line (Wu and Bong, 1994;Kundu, 2002;Kundu, 2007a;Kundu, 2007b;Kundu, 2008;Kundu, 2009). Owing to small temperature variation in the fin between fin-base and fin-tip, it can be assumed that the thermal conductivity of the fin material is a constant.…”

“…The relationship between heat and mass transfer coefficients can be obtained from the Chilton-Colburn analogy (Chilton and Colburn, 1934). The relationship between the saturated water film temperature T and the corresponding www.intechopen.com saturated humidity ratio ω is approximated by a linear function (Wu and Bong, 1994;Kundu, 2002;Kundu, 2007a;Kundu, 2007b;Kundu, 2008;Kundu, 2009) in this study:…”

“…Later an extensive analytical works on the performance and optimization analysis of wet fins was carried out by applying this linear relationship. A technique to determine the performance and optimization of straight tapered longitudinal fins subject to simultaneous heat and mass transfer has been established analytically by Kundu (2002) and Kundu and Das (2004). The performance and optimum dimensions of a new fin, namely, SRC profile subject to simultaneous heat and mass transfer have been investigated by Kundu (2007a;2009a).…”

Analytical investigation of porous pin fins with variable section in fully-wet conditions

“…Naphon studied the annular fin under drysurface, partially wet-surface, and fully wet-surface conditions [6]. In many , a linear function is used to determine the relationship between the dry-bulb temperature and specific humidity [7][8][9][10] to analyse the performance of the wet fins. Assuming the temperature of the tip is dew point temperature [11], Sharqawy and Zubair determined the fin efficiency of straight wet fins by considering a new linear relationship between specific humidity and sensible temperature.…”

Shape optimization for the minimum volume of pin fins in simultaneous heat and mass transfer environments

“…Increasing heat conduction in the direction of flow requires an incremented cross-section for better utilization of fin material. Much research has been devoted to the study of wet fins, particularly fins with a variety of tapered profiles, including step reduction in local cross section [10,11], trapezoidal [12,13], triangular [14,15], and convex parabolic [16]. It can be demonstrated (all other conditions being equal) that these complex-profile fins are lighter in weight than flat fins.…”