A computational study of mixed convective heat and mass transfer from a shrouded vertical non-isothermal fin array during dehumidification process. (December 2015)

• Record Type: Journal Article
• Authors: Giri, Asis; Pathak, Kankan Kishore; Das, Biplab
• Is Part Of: International journal of heat and mass transfer. Volume 91(2015:Dec.)
• Page Start: 264
• Page End: 281
• Publication Date: 2015-12
• Subjects: Mixed convection -- Dehumidification -- Non-isothermal fin -- Pressure drop -- Nusselt number; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2015.07.079
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: A study of mixed convection heat and mass transfer over the fin array undergoing dehumidification. Finite thickness of non-isothermal fin is considered. Decoupling method is invoked to find out induced and forced convection velocity components. Condensing Nusselt number is much greater than the sensible heat Nusselt number. Induced velocity, pressure drop, overall sensible and condensing Nusselt number are correlated. Abstract: A computational study is made on simultaneous heat and mass transfer from a shrouded vertical non-isothermal finite thickness fin array representing dehumidification process undergoing mixed convection. Governing equations involve number of parameters, namely, dimensionless fin spacing (0.1 ⩽ S ∗ ⩽ 0.5), dimensionless clearance (0 ⩽ t c ∗ ⩽ 0.2), non-dimensional fin conductance parameter (2830.18 ⩽ Ω ⩽ 5660.37), thermal Grashof number (1.04 × 10 5 ⩽ Grt ⩽ 4.82 × 10 5 ), mass Grashof number (2.9 × 10 4 ⩽ Grm ⩽ 1.36 × 10 5 ), and dimensionless inlet mixed convection velocities (1123 ⩽ Win, mix ⩽ 2879). Induced velocity is decoupled from the mixed convection velocity and correlated with the governing parameters. Fin temperature distribution shows significant variation along the fin height as well as along the axial direction, especially near the entrance. Local thermal Nusselt number and local condensing Nusselt number show monotonic decreasing trend along the axial direction. Finally induced velocity, pressure drop, overall thermal Nusselt number, and overall condensing Nusselt number is correlated with the governing parameters.