Fluid flow and heat transfer in the entrance region of rod bundles

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5293114

Narasimhan, R

Asymmetry in the form of three types of eccentricities were studied. It was found that the flow is affected only in the immediate vicinity of the displaced rods. Every where else the symmetry of the flow is maintained. The fully developed as well as the developing f.Re values decrease as the eccentricity increases. Maximum decrease in f.Re values occurs at the geometry which has the maximum pressure drop. Significant changes in the development length from the symmetric case are noted only for whole bundle eccentricities. Heat transfer in the combined entrance region of symmetric and asymmetric bundles was solved. It was found in symmetric bundles the fully developed and the developing local bundle Nusselt number increases with the peripheral rod radius to a maximum after which it decreases. The effect of mixed convection in the entrance region of symmetric bundles was studied. It was found when buoyancy aids the flow the Nusselt number increases and when buoyancy opposes the flow the Nusselt number decreases.

• Research Organization: Miami Univ., Coral Gables, FL (USA)
• OSTI ID: 5293114
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ENERGY TRANSFER
FLUID FLOW
HEAT TRANSFER
NUSSELT NUMBER
PRESSURE DROP
ROD BUNDLES