Comparison heat and mass transfer coefficients in the shell side of the hollow fiber membrane module

Abstract

Abstract. The article discusses the theory associated with the determination of total heat and mass transfer coefficients in a membrane module. The equations for determining Nusselt and Sherwood numbers on the shell side of the module are presented. The design of the membrane module and the test bench are also discussed. The convective coefficients of heat and mass transfer on the shell side have been determined on the basis of the measurements. Calculation results obtained from correlation equations were then compared with the results of experimental investigations of convective heat and mass transfer coefficients in the airwater system. The equation is indicated appropriate for use in the case analysed.

Use of a membrane module for semi-direct air evaporative cooling

“…Resistances in equations (16) and (17) can be obtained by equations (18) to (21), respectively 23 where h o is the convective heat transfer (W m −2 K −1 ); k o is the convective mass transfer (m s −1 ); D vm is the effective moisture diffusivity (m 2 s −1 ); λ m is the membrane heat conductivity (W m −1 K −1 ); d i is the membrane inner diameter (m); d o is the membrane outer diameter (m).…”

“…Correlation equations allowing to determine Nu and Sh numbers on the shell side of the membrane module are summarized in Englart. 23 Nu and Sh number can also be determined by means of the analogy to heat and mass transfer, 26 using equation (29) …”

“…The experimental range of Reynolds number used in this study (527 < Re < 762) was slightly larger than the range for the equation (30). However, in Englart 23 for 534 < Re < 760, among the equations compared describing the mass transfer on the shell side of the module, the best fit of experimental data was obtained from the equation developed by Prasad and Sirkar. 27…”