Buoyancy-induced convection in the thermal diffusion cloud chamber

Ferguson, Frank T.; Nuth, Joseph A.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p264
Academic Journal
An important question currently concerning thermal diffusion cloud chamber operation is what effect, if any, does buoyancy-induced convection have on measured supersaturations. In this paper we highlight some of the important results from a model of the chamber which includes such convective effects. The results indicate that the reduction in the maximum attainable supersaturation is likely to be small, but a general method of determining when these effects will become significant is needed.


Related Articles

  • Vapor transport within the thermal diffusion cloud chamber. Ferguson, Frank T.; Sagnella, Diane E.; Heist, Richard H.; Straub, John E.; Nuth, Joseph A.; Thirumalai, D. // Journal of Chemical Physics;11/1/2000, Vol. 113 Issue 17 

    A review of two different, one-dimensional models of the vapor transport within the thermal diffusion cloud chamber (TDCC) is presented. In one case the assumption is made that there are no convective fluxes within the chamber and that heat and mass transport occur by diffusion only. Although in...

  • Stable stratification alteration in a thermal diffusion cloud chamber. Schaeffer, N.; Utheza, F.; Garnier, F.; Lauriat, G. // Journal of Chemical Physics;11/8/2000, Vol. 113 Issue 18 

    The formation of clouds resulting from the homogeneous condensation of vapor phase diluted in a background or carrier gas was studied numerically. The effect of the background gas on the nucleation process in a cloud chamber heated from below is discussed. The computations were performed using...

  • Two-dimensional transport and wall effects in the thermal diffusion cloud chamber. II. Stability... Bertelsmann, Anne; Heist, Richard H. // Journal of Chemical Physics;1/8/1997, Vol. 106 Issue 2, p624 

    Addresses the operational stability of the vapor-gas mixture in a diffusion cloud chamber with respect to density profile extrema and the accompanying possibility of buoyancy-driven convective flow disturbances. Method for the estimation of the limiting total pressure in a cloud chamber that...

  • Condensation of a supersaturated vapor. XI. Stable operation of a thermal diffusion cloud chamber. Fisk, Jeffery A.; Chakarov, Vasil M.; Katz, Joseph L. // Journal of Chemical Physics;6/1/1996, Vol. 104 Issue 21, p8657 

    A key approximation in the analysis of upward thermal diffusion cloud chambers is that both the heat flux and mass flux (in the center part of the chamber) are plane parallel. Procedures for determining when this approximation is valid are described. The key experimental parameter is the amount...

  • The flow diffusion nucleation chamber: A quantitative tool for nucleation research. Vohra, Vivek; Heist, Richard H. // Journal of Chemical Physics;1/1/1996, Vol. 104 Issue 1, p382 

    We have developed a flow diffusion nucleation chamber designed to quantitatively investigate the nucleation of vapors. The design and operational characteristics of the nucleation chamber are presented and discussed. Critical supersaturation data obtained with this nucleation chamber are...

  • Onset of Convection in a Rotating Semi-Infinite Fluid: Theory and Experiment. Brickman, David; Kelley, Dan E. // Atmosphere -- Ocean (Canadian Meteorological & Oceanographic Soc;Mar1995, Vol. 33 Issue 1, p163 

    We look at the development of the first plumes that emerge from a convectively unstable boundary layer by modelling the process as the instability of a fluid with a time-dependent mean density field. The fluid is semi-infinite, rotating, dissipative -- characterized by the ratio of its viscosity...

  • Thermal diffusion cloud chamber—new criteria for proper operation. Heist, Richard H.; Martinez, Daniel; Chan, Yuk; Bertelsmann, Anne // AIP Conference Proceedings;2000, Vol. 534 Issue 1, p280 

    We report results of new nucleation experiments involving 1-pentanol with hydrogen as the background gas utilizing the high-pressure diffusion cloud chamber (HPCC). We discuss the important issue of buoyancy-driven convective motion and cloud chamber operation, and we focus on the lower total...

  • Dynamic and Double-Diffusive Instabilities in a Weak Pycnocline. Part II: Direct Numerical Simulations and Flux Laws. Flanagan, Jason D.; Radko, Timour; Shaw, William J.; Stanton, Timothy P. // Journal of Physical Oceanography;Aug2014, Vol. 44 Issue 8, p1992 

    This study examines the interaction of diffusive convection and shear through a series of 2D and 3D direct numerical simulations (DNS). The model employed is based on the Boussinesq equations of motion with oscillating shear represented by a forcing term in the momentum equation. This study...

  • Homogeneous nucleation rate measurements in supersaturated water vapor. Brus, David; Ždímal, Vladimír; Smolík, Jirí // Journal of Chemical Physics;11/7/2008, Vol. 129 Issue 17, p174501 

    The rate of homogeneous nucleation in supersaturated vapors of water was studied experimentally using a thermal diffusion cloud chamber. Helium was used as a carrier gas. Our study covers a range of nucleation rates from 3×10-1 to 3×102 cm-3 s-1 at four isotherms: 290, 300, 310, and 320...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics