Circumferential temperatures for two-phase: air and aqueous polymer (purely viscous) solutions flowing over a horizontal cylinder were measured experimentally. The cylinder was heated by passing direct electric current through it. The peripherally averaged heat transfer coefficient for purely viscous non-Newtonian fluids, at any fixed flow rate, decreases with increasing polymer concentration. A new correlation is proposed for predicting the Nusselt number for two-phase: air and power-law fluid flows over a heated cylinder in cross flow.

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