Natural convection and wall condensation or evaporation in humid air-filled cavities subjected to wall temperature variations

被引:36
作者
Sun, H. [1 ]
Lauriat, G. [1 ]
Nicolas, X. [1 ]
机构
[1] Univ Paris Est, CNRS, Lab Modelisat & Simulat Multi Echelle, CNRS,MSME,UMR 8208, F-77454 Champs Sur Marne 2, Marne La Vallee, France
关键词
Thermosolutal convection; Humid air; Surface condensation/evaporation; Cavity flows; Numerical simulations; HEAT-TRANSFER; CONCENTRATION GRADIENTS; HORIZONTAL TEMPERATURE; SQUARE CAVITY; ENCLOSURE; FLOW;
D O I
10.1016/j.ijthermalsci.2010.12.010
中图分类号
O414.1 [热力学];
学科分类号
摘要
Heat and mass transfer by natural convection coupled to wall surface condensation or evaporation in a two-dimensional cavity subjected to uniform, but time-dependent wall temperatures is investigated numerically. At initial state, the cavity is filled with quiescent humid air at uniform temperature and density. By decreasing the wall temperature, condensation occurs at the four wall surfaces until an equilibrium thermodynamic state is reached. The walls are then heated and evaporation of the liquid water film is considered. Various time variations of the wall temperature were investigated. Since the mass of humid air and average pressure experience large changes during transient regimes, a weakly compressible formulation has been used. The model considers only condensation/evaporation under the thin film approximation. The computations were carried out for temperatures of humid air varying between 300 K and 350 K, and pressure variations around atmospheric pressure. The typical width of the cavities is L = 0.1 m. The results show that very different transient flow structures occur during condensation and evaporation processes. The thickness distributions of the water films condensed at the walls are discussed, and it is shown that the thicknesses reflect the flow structures. The effect of the cavity aspect ratio reveals more complicated results than for convection without phase change at the wall surfaces. (C) 2010 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码:663 / 679
页数:17
相关论文
共 50 条
[42]   Effect of partition wall on natural convection heat transfer in a vertical air layer [J].
Yamaguchi, Y ;
Asako, Y .
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2001, 123 (03) :441-449
[43]   Effect of a Magnetic Field on Natural Convection in a Nanofluid-Filled Enclosure with a Linearly Heated Wall Using LBM [J].
Kefayati, Gh R. .
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING, 2014, 39 (05) :4151-4163
[44]   NATURAL CONVECTION HEAT TRANSFER AND AIR FLOW IN RECTANGULAR ENCLOSURES WITH A WAVY WALL [J].
Tekkalmaz, Mesut .
ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY, 2013, 33 (01) :21-31
[45]   Analysis of Natural Convection and Melting in a Separated Cavity with Nano-enhanced Phase Change Material filled wall [J].
Oztop, Hakan F. ;
Cosanay, Hakan ;
Biswas, Nirmalendu ;
Selimefendigil, Fatih .
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING, 2024, 49 (08) :10653-10668
[46]   Entropy generation and natural convection in a wavy-wall cavity filled with a nanofluid and containing an inner solid cylinder [J].
Alnajem, Mohammed Hussein S. ;
Alsabery, Ammar I. ;
Hashim, Ishak .
2ND INTERNATIONAL CONFERENCE ON SUSTAINABLE ENGINEERING TECHNIQUES (ICSET 2019), 2019, 518
[47]   Laminar Natural Convection of Bingham Fluids in Inclined Differentially Heated Square Enclosures Subjected to Uniform Wall Temperatures [J].
Yigit, Sahin ;
Poole, Robert J. ;
Chakraborty, Nilanjan .
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2015, 137 (05) :1-12
[48]   Numerical investigation on the effect of harmonic horizontal-axis rotation on laminar natural convection in an air-filled enclosure [J].
Yu, Guojun ;
Lian, Zhiwei ;
Gan, Wei ;
Ji, Jun .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2020, 152
[49]   Numerical analysis of conjugate convection-conduction heat transfer in an air-filled cavity with a rhombus conducting block subjected to subdivision: Cooperating and opposing roles [J].
El Mansouri, Abdelfattah ;
Hasnaoui, M. ;
Amahmid, A. ;
Alouah, M. .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2020, 150
[50]   Investigation of a large top wall temperature on the natural convection plume along a heated vertical wall in a square cavity [J].
Wu, W. ;
Ewing, D. ;
Ching, C. Y. .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2008, 51 (7-8) :1551-1561