Experimental and numerical studies of the separation of a smooth attached buoyant flow from the inner wall of a duct, as the duct discharges into a quiescent environment, are reported. The associated penetration of neutrally buoyant ambient fluid into the duct is called cold inflow. The experimental study was carried out for air flows over ranges of Reynolds and Froude numbers, based on duct radius, of Re = 2400 to 3300 and Fr = 0.68 to 2.69. The experiments provide information on the onset and extent of cold inflow in a turbulent flow regime. Spatial profiles of fluctuating temperature reveal a wedge-shaped cold inflow region at the wall near the exit when Fr is decreased below a critical value. The numerical study examines the influence of Re and Fr on the structure of the cold inflow phenomenon at moderate Reynolds numbers (Re = 200 to 500 and Fr = 1 to 5). Steady-state, two-dimensional, laminar flow solutions reveal a region of downward-flowing cold air near the wall of the duct which leads to premature separation of the wall boundary layer. The separated boundary layer merges into the buoyant jet above the duct exit.
Skip Nav Destination
Article navigation
Research Papers
Experimental and Numerical Studies of Cold Inflow at the Exit of Buoyant Channel Flows
Vijay Modi,
Vijay Modi
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853
Search for other works by this author on:
K. E. Torrance
K. E. Torrance
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853
Search for other works by this author on:
Vijay Modi
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853
K. E. Torrance
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853
J. Heat Transfer. May 1987, 109(2): 392-399 (8 pages)
Published Online: May 1, 1987
Article history
Received:
April 7, 1986
Online:
October 20, 2009
Citation
Modi, V., and Torrance, K. E. (May 1, 1987). "Experimental and Numerical Studies of Cold Inflow at the Exit of Buoyant Channel Flows." ASME. J. Heat Transfer. May 1987; 109(2): 392–399. https://doi.org/10.1115/1.3248093
Download citation file:
Get Email Alerts
Cited By
Effect of Strip-Fin Height on Jet Impingement Heat Transfer in a Rectangular Channel at Two Jet-to-Target Surface Spacings
J. Heat Mass Transfer (May 2024)
Turbulent Pulsating Convective Flow in the Quasi-Steady and Low-Frequency Regimes
J. Heat Mass Transfer (July 2024)
Related Articles
Laminar Flow and Heat Transfer in the Entrance Region of Trapezoidal
Channels With Constant Wall Temperature
J. Heat Transfer (January,2006)
1990 Max Jakob Memorial Award Lecture: Viscoelastic Fluids: A New Challenge in Heat Transfer
J. Heat Transfer (May,1992)
Heat Transfer Through a Pressure-Driven Three-Dimensional Boundary Layer
J. Heat Transfer (May,1991)
Heat Transfer in a Laminar Channel Flow Generated by Injection Through Porous Walls
J. Fluids Eng (August,2007)
Related Proceedings Papers
Related Chapters
The Design and Implement of Remote Inclinometer for Power Towers Based on MXA2500G/GSM
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Extended Surfaces
Thermal Management of Microelectronic Equipment