Local friction and heat transfer behavior of water in a turbulent pipe flow with a large heat flux at the wall
- Drexek Univ., Philadelphia, PA (United States)
The present study investigated the behavior of friction and heat transfer coefficients of water flowing turbulently in a relatively long (i.e., 950 diameter long) circular pipe. When a large heat flux was applied at the wall, the viscosity of water significantly decreased along the axial direction due to the increasing temperature of water. A concept of a `redeveloping region` was introduced, where the local heat transfer coefficient increased while the local friction coefficient decreased due to the above-mentioned viscosity change. The present study proposed the use of local bulk-mean temperature to determine local Nusselt numbers by using local Reynolds (Re{sub LB}) and Prandtl numbers (Pr{sub LB}), a method that automatically took into account the effect of axial viscosity change on the evaluation of local heat transfer coefficients. A new turbulent heat transfer correlation for the prediction of the local Nusselt number is given as Nu{sub x} = 0.00425 Re{sub LB}{sup 0.979} Pr{sub LB}{sup 0.4}({mu}{sub w}/{mu}{sub b}){sup -0.11}. 16 refs., 6 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 68017
- Journal Information:
- Journal of Heat Transfer, Journal Name: Journal of Heat Transfer Journal Issue: 2 Vol. 117; ISSN JHTRAO; ISSN 0022-1481
- Country of Publication:
- United States
- Language:
- English
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