COMBINED HEAT AND MASS-TRANSFER BY NATURAL-CONVECTION AT HORIZONTAL CYLINDER ELECTRODES

被引：9

作者：

SARAC, H

WRAGG, AA

PATRICK, MA

机构：

[1] School of Engineering, University of Exeter, Exeter

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 1991年 / 18卷 / 06期

关键词：

D O I：

10.1016/0735-1933(91)90036-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Simultaneous heat and mass transfer in free convection at horizontal cylinder electrodes has been investigated experimentally wing the electrochemical limiting diffusion current technique. The convective flow patterns occurring have been observed using Schlieren photography. The results confirmed the we of a combined Grashof number (GR(m)) to account for thermal and concentration buoyancy effects. Various combinations of electroactive species concentration, cylinder diameter and cylinder surface temperature have been used. Results have been succesfully correlated by the equations Sh = 0.53(GR(m)Sc)1/4, 7 X 10(7) < GR(m)Sc < 4 X 10(9) and Sh = 0.018(GR(m)Sc)2/5, 4 X 10(9) < GR(m)Sc < 10(11). The experiments cover the range of mass transfer and heat transfer Grashof numbers 3.64 X 10(4) < Gr(m) < 3.02 X 10(6), 5.67 X 10(4) < Gr(h) < 6.55 X 10(6).

引用

页码：853 / 863

页数：11

共 15 条

[1] Somers, Pittsburgh, Theoretical Considerations of Combined Thermal and Mass Transfer From a Vertical Flat Plate, J. Applied Mechanics, 25, (1956)
[2] Mathers, Madden, Piret, Simultaneous Heat and Mass Transfer In Free Convection, Industrial & Engineering Chemistry, 49, (1957)
[3] Wilcox, Simulataneous Heat and Mass Transfer in Free Convection, Chemical Engineering Science, 13, (1961)
[4] Marchiano, Arvia, Diffusional Flow Under Non-Isothermal Laminar Free Convection at a Thermal Convective Electrode, Electrochimica Acta, 13, (1968)
[5] Marchiano, Arvia, Theoretical Steady Current/Voltage Characteristics for Simple Electrode Processes Under Laminar Isothermal and Non-Isothermal Free Convection, Electrochimica Acta, 15, (1970)
[6] De Leeuw Den Bouter, De Munnik, Heertjes, Simulataneous Heat and Mass Transfer in Laminar Free Convection From a Vertical Plate, Chem. Eng. Science, 23, (1968)
[7] Novak, Rousar, Simulataneous Flow of Ions and Heat to a Plate Electrode in the Region of Natural Convection, Coll. Czech. Chem. Comm., 44, (1979)
[8] Novak, Rousar, Simultaneous Mass and Heat Transfer to a Plate Electrode in the Region of Free Convection with Antiparallel Fluxes of Mass and Heat, Col3l. Czech. Chem. Comm., 48, (1983)
[9] Wragg, Nasiruddin, Ionic Mass Transfer by Free Convection with Simultaneous Heat Transfer, Electrochimica Acta, 18, (1983)
[10] Weber, Astraukas, Petsalis, Natural Convection Mass Transfer to Nonspherical Objects at High Rayleigh Number, an. J. Chem. Eng., 62, (1984)

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