On page 580 (Nomenclature), the expression of the Rayleigh number Ra should be gβqH 4 ∕vαk. Also, on page 583, a corrected form of the dimensionless time is t∕H 2 ∕α 0 . The authors gratefully acknowledge Dr. M. M. Awad of Mansoura University, Mansoura, Egypt for suggestions which led to these corrections.
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