SOLIDIFICATION OF A BINARY-SOLUTION ON A COLD ISOTHERMAL SURFACE

被引：39

作者：

BRAGA, SL

VISKANTA, R

机构：

[1] Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 1990年 / 33卷 / 04期

关键词：

D O I：

10.1016/0017-9310(90)90172-Q

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The freezing of water-salt solutions on a horizontal wall is investigated experimentally and theoretically. The growth of the two-phase solid-liquid region is observed for NaCl-H2O and NH4C1-H2O systems under different temperature and concentration conditions. A unidirectional mathematical model is developed to predict the temperature distribution in a semi-infinite medium based on the assumption that a local thermodynamic equilibrium exists between the solid and the liquid in the two-phase region. The transport of heat is by diffusion, and convection in the liquid is absent. The mass diffusion is neglected and the growth of the crystals is governed by the transport of heat. In all experiments the salt concentration in the solution is smaller than the eutectic composition, and the wall temperature is higher than the eutectic temperature. The predicted temperature profiles agree well with experimental data. The local solid fractions as well as the salt concentrations are shown as a function of the position. © 1990.

引用

页码：745 / 754

页数：10

共 17 条

[1] TRANSPORT PROPERTIES OF 2-PHASE MATERIALS WITH RANDOM STRUCTURE [J].

BATCHELOR, GK .

ANNUAL REVIEW OF FLUID MECHANICS, 1974, 6 :227-255

[2]

Carruthers J.R., 1979, CRYSTAL GROWTH TUTOR, P157

[3]

CHELLAIAH S, 1988, EXPL HEAT TRANSFER, V1, P181

[4] ORIGIN OF FRECKLES IN UNIDIRECTIONALLY SOLIDIFIED CASTINGS [J].

COPLEY, SM ;

GIAMEI, AF ;

JOHNSON, SM ;

HORNBECK.MF .

METALLURGICAL TRANSACTIONS, 1970, 1 (08) :2193-&

[5] SELECTIVE FREEZING OF A DILUTE SALT SOLUTION ON A COLD ICE SURFACE [J].

FANG, LJ ;

CHEUNG, FB ;

LINEHAN, JH ;

PEDERSEN, DR .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 1984, 106 (02) :385-393

[6]

Flemings M.C., 1974, SOLIDIFICATION PROCE

[7]

HOBBS PV, 1974, ICE PHYSICS

[8] DYNAMIC SOLIDIFICATION OF A BINARY MELT [J].

HUPPERT, HE ;

WORSTER, MG .

NATURE, 1985, 314 (6013) :703-707

[9]

HUPPERT HE, 1984, ANNU REV EARTH PL SC, V12, P11

[10]

Minkoff I, 1986, SOLIDIFICATION CAST

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