Heat transfer and pressure drop in a tube bank inclined with respect to the flow

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5566983

Yanez Moreno, A A

This research is intended to lend understanding and to quantify the heat-transfer and fluid-flow characteristics for yawed tube banks in both staggered and in-line arrays. The investigated range of yaw angle was from 90 (crossflow) to 45/sup 0/, while the freestream Reynolds number (based on the tube diameter) ranged between 7000 and 45,000. The transverse and longitudinal center-to-center distances between the tubes were S/sub T//D = S/sub L//D = 2, respectively. The heat-transfer experiments were carried out on a row-by-row basis. Pressure drop measurements were made not only upstream and downstream of the tube bank but also within it. The patterns of fluid flow adjacent to the tubes were visualized using the oil-lampblack technique. A detailed study was carried out to determine the heat-transfer characteristics of a yawed single cylinder. The yaw angle range was between 90 and 30/sup 0/, and flow visualization was also performed. The pressure measurements showed that the overall dimensionless pressure drop for the staggered array is higher than that for the in-line array for a given Reynolds number or yaw. The flow-visualization patterns showed that the boundary layer separation depends on the yaw angle. For the single cylinder, the Nusselt number varied with the yaw angle in an undulating manner and did not correlate with the Independence Principle.

• Research Organization: Minnesota Univ., Minneapolis (USA)
• OSTI ID: 5566983
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CYLINDERS
ENERGY TRANSFER
FLOW VISUALIZATION
FLUID FLOW
HEAT TRANSFER
MEASURING METHODS
NUSSELT NUMBER
PRESSURE DROP
REYNOLDS NUMBER
TUBES