On thermal stress and thermal creep convection in vapour crystal growth under microgravity

被引:0
|
作者
Viviani, A [1 ]
Golia, C [1 ]
机构
[1] Univ Naples 2, Dipartimento Ingn Aerosp, I-80131 Aversa, Italy
来源
2ND EUROPEAN SYMPOSIUM ON UTILISATION OF THE INTERNATIONAL SPACE STATION | 1999年 / 433卷
关键词
D O I
暂无
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
In recent years a new impetus for studying vapour crystal growth fluid-dynamics has come from the utilization of space microgravity environment, where low-gravity conditions are expected to reduce gravity-driven disturbances and, therefore, to enhance the final properties of the crystals, resulting from the complex physicochemical phenomena occurring in the vapour phase. However, some "gas-kinetic" effects, usually masked by gravity on Earth, such as thermal and concentration stresses (volume-driving actions), thermal and concentration creep (surface-driving actions) have been demonstrated to become important sources of convection under the conditions encountered in low-gravity crystal growth. The new sources of convection arising from non-linear irreversible thermodynamic effects (non-Navier-Stokes fluid-dynamics) and slip boundary conditions have been studied both theoretic ally and numerically; 15 classes of convection, and a priori conditions for the existence and characterization of all possible classes of convection in terms of the problem's data, have been identified. Then, numerical results are obtained with the new set of field equations (Burnett equations with slip conditions) and compared, for different gravity levels, with the corresponding solution of the Navier-Stokes approximation. On the base of the previous results, we present the idea of an experimental research, for the International Space Station, dealing with the new transport mechanisms. The authors intend to study the occurrence, in a reduced gravity environment, of new types of convective flows induced by thermal stresses and thermal creep, in order to definitively validate the theoretical and numerical results and to obtain, for the first time, relevant experimental data on the phenomenon.
引用
收藏
页码:297 / 308
页数:12
相关论文
共 50 条
  • [11] Numerical and experimental study of thermal convection under quasistatic component of microgravity field
    Yuferev, VS
    Konstantinov, VB
    Budenkova, ON
    FIRST INTERNATIONAL SYMPOSIUM ON MICROGRAVITY RESEARCH & APPLICATIONS IN PHYSICAL SCIENCES AND BIOTECHNOLOGY, VOLS I AND II, PROCEEDINGS, 2001, 454 : 167 - 174
  • [12] Thermophoretic measurements in presence of thermal stress convection in aerosols in microgravity conditions of drop tower
    A. A. Vedernikov
    F. Prodi
    G. Santachiara
    S. Travaini
    F. Dubois
    J. C. Legros
    Microgravity - Science and Technology, 2005, 17 (3) : 101 - 104
  • [13] Thermophoretic measurements in presence of thermal stress convection in aerosolsin microgravity conditions of drop tower
    Vedernikov, AA
    Prodi, F
    Santachiara, G
    Travaini, S
    Dubois, F
    Legros, JC
    MICROGRAVITY SCIENCE AND TECHNOLOGY, 2005, 17 (03) : 102 - 105
  • [14] Fluctuations of Thermal-Solutal Capillary Convection at Different Mat Numbers under Microgravity
    Fan, Jungeng
    Liang, Ruquan
    MICROGRAVITY SCIENCE AND TECHNOLOGY, 2022, 34 (02)
  • [15] Fluctuations of Thermal-Solutal Capillary Convection at Different Mat Numbers under Microgravity
    Jungeng Fan
    Ruquan Liang
    Microgravity Science and Technology, 2022, 34
  • [16] THERMAL-CONVECTION DURING BRIDGMAN CRYSTAL-GROWTH
    CARLSON, FM
    FRIPP, AL
    CROUCH, RK
    JOURNAL OF CRYSTAL GROWTH, 1984, 68 (03) : 747 - 756
  • [17] Review: Thermal convection and related instabilities in models of crystal growth from the melt on earth and in microgravity: Past history and current status
    Lappa, M
    CRYSTAL RESEARCH AND TECHNOLOGY, 2005, 40 (06) : 531 - 549
  • [18] Growth kinetics and thermal stress in AlN bulk crystal growth
    Wu, B
    Ma, RH
    Zhang, H
    Dudley, M
    Schlesser, R
    Sitar, Z
    JOURNAL OF CRYSTAL GROWTH, 2003, 253 (1-4) : 326 - 339
  • [19] Effect of convection on dendritic growth under microgravity conditions
    Koss, M.B.
    Bushnell, L.T.
    Lacombe, J.C.
    Glicksman, M.E.
    Chemical Engineering Communications, 1996, 152-153 : 351 - 363
  • [20] The effect of convection on dendritic growth under microgravity conditions
    Koss, MB
    Bushnell, LT
    Lacombe, JC
    Glicksman, ME
    CHEMICAL ENGINEERING COMMUNICATIONS, 1996, 153 : 351 - 363