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An empirical correlation for electrohydrodynamic enhancement of natural convection

Authors
Journal
International Journal of Heat and Mass Transfer
0017-9310
Publisher
Elsevier
Publication Date
Volume
43
Issue
11
Identifiers
DOI: 10.1016/s0017-9310(99)00270-7

Abstract

Abstract A correlation for predicting the extent of electrohydrodynamic enhancement of natural convection from heated horizontal cylinders is presented. This correlation is supported with results from two different experiments; the first involves natural convection from a thin platinum wire immersed in R-123 with a uniform electric field, while the second involves natural convection from a flooded tube immersed in R-123 in a non-uniform electric field. The Nusselt number enhancement is correlated in terms of a “corrected electrical Rayleigh number”, Ra El, to account for the effect of a non-uniform electric field on natural convection. The correlation is valid for the range 4.0×10 3≤ Ra El≤8.0×10 8.

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