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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

A NATURAL CIRCULATION LOOP WITH DOUBLE DIFFUSIVE PROCESSES - STEADY FLOW AND THE ONSET OF MOTION

Get access (open in a dialog) DOI: 10.1615/IHTC8.3130
pages 1551-1556

Resumo

A theoretical study is presented for a natural circulation loop (thermosyphon) with double diffusive processes, where both temperature and salinity gradients affect the flow, heat and mass transfer. The loop consists of two vertical channels connecting top and bottom containers. A one dimensional model is adopted, and the governing conservation equations are written - continuity, momentum, energy and species. The equations are solved to obtain the steady state velocity and temperature and salinity distributions. It is found that there exists a trivial solution of no flow, v = 0, and another solution for a finite flow when a certain condition is satisfied. This condition is found as a marginal stability line in the RS - RT plane, depending on the ratio of thermal to solute diffusivities, q, where RT and RS are the modified thermal and saline Rayleigh numbers. The trivial solution is stable when this condition is not met, while if the destabilizing parameters of a positive RT or negative RS are large enough, any perturbation would grow to establish a steady flow.