Natural convection heat transfer between arrays of horizontal cylinders and their enclosure

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6220830

Weaver, R A; Warrington, R O

The natural convection heat transfer between arrays of horizontal, heated cylinders and their isothermal, cooled enclosure was experimentally investigated. Four different cylinder arrays were used: two in-line and two staggered. Four fluids (air, water, 20 cs silicone, and 96% glycerine) were used with Prandtl numbers ranging from 0.705 to 13090.0. There was no significant change in the Nusselt number between isothermal and constant heat flux conditions of the cylinder arrays. The average heat transfer coefficient was most affected by the spacing between cylinders and the total surface area of the cylinder arrays. The enclosure reduced the expected increase in both the average and the local heat transfer coefficients caused by changing the inner body from an in-line arrangement to a staggered arrangement of comparable spacing. An increase in fluid viscosity reduced the influence of the geometric effects.

• Research Organization: Los Alamos National Lab., NM (USA); Louisiana Tech Univ., Ruston (USA). Dept. of Mechanial Engineering
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6220830
• Report Number(s): LA-UR-84-3651; CONF-841201-22; ON: DE85003773
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
AIR
ALCOHOLS
CONVECTION
CYLINDERS
ENERGY TRANSFER
FLUIDS
GASES
GLYCEROL
HEAT TRANSFER
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MASS TRANSFER
NATURAL CONVECTION
NUSSELT NUMBER
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
PRANDTL NUMBER
SILICONES
SILOXANES
VISCOSITY
WATER