Variable-property, constant-property, and entrance-region heat transfer results for turbulent flow of water and oil in a circular tube

✍ Scribed by J.A. Malina; E.M. Sparrow

• Publisher: Elsevier Science
• Year: 1964
• Tongue: English
• Weight: 918 KB
• Volume: 19
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(64)85102-2

✦ Synopsis

Measurements have been made of the fully developed and entrance-region heat transfer characteristics of a hydrodynamically-developed flow of oil and water in an electrically-heated tube. The Prandtl number range was 3-75. The effect of variable fluid properties was isolated by varying the local wall-to-bulk temperature difference at fixed values of the local Reynolds and Prandtl numbers. It was found that both the Sieder-Tate and the Colburn corrections overestimated the effect of variable fluid properties. Constant-property heat transfer results were deduced by extrapolating the measured heat transfer coefficients to the condition of zero wall-to-bulk temperature difference. Except at low Reynolds numbers for the oil tests (Pr = 48 and 75), the constant-property results were underestimated by the Dittus-Boelter equation Nu = 0.023 ReO'* Pr 0 4. Local heat transfer coefficients were measured