RT Journal Article
ID 27948eb62a35e916
A1 Yousefi, Tooraj
A1 Ashjaee, Mehdi
A1 Yazdani, Sajjad
A1 Mahmoodi, H.
T1 Effect of Inclination Angle on Free Convection from an Elliptic Tube Confined between Walls
JF Heat Transfer Research
JO HTR
YR 2009
FD 2009-06-09
VO 40
IS 6
SP 537
OP 553
K1 free convection; inclination angle; elliptic tube; adiabatic walls
AB Laminar free-convection heat transfer from an inclined isothermal horizontal elliptic tube located in an infinite medium and between two adiabatic walls has been investigated experimentally by the Mach-Zender interferometry technique. The axis ratio of the elliptic tube is 0.67. The present paper focuses on the effect of an inclination angle of the tube with the horizon, wall spacing, and the Rayleigh number variation on the local and average free-convection heat transfer from the tube surface. To study the effect of axial inclination on free-convection heat transfer the tube has been inclined at five different angles (γ = 0°, 20°, 45°, 7°, 90°). The local and average Nusselt numbers are determined for Rayleigh numbers ranging from 103 to 2.5 × 103 . Also the ratio of the wall spacing to the tube projected length is changed from 1.25 to infinity. An optimum wall spacing distance for each inclination angle and Rayleigh number has been observed in which the Nusselt number is maximum.
PB Begell House
LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,665951ab235c9eda,27948eb62a35e916.html