Convective heat transfer in the impingement region of a buoyant plume

Journal Article · Sun Feb 01 04:00:00 EST 1987 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3248031· OSTI ID:5316886

Alpert, R L ^[1]

---

1. Factory Mutual Research Corp., Norwood, MA (USA)

Fires of hazardous scale generate turbulent plumes within which convective heat transfer to surfaces can be important. Relatively little work has been done on developing reliable convective heat transfer correlations applicable to such large-scale flows. The present study, confined to heat transfer rates within the plume impingement region on a ceiling, achieves plume Reynolds numbers an order of magnitude beyond those of previous work by performing laboratory-scale experiments at elevated ambient pressures. Flow disturbances which normally cause scatter in plume heat transfer data are reduced as a consequence of this technique. It is shown that impingement zone Nusselt number depends on the 0.61 power of plume Reynolds numbers in the range of 10{sup 4} to 10 {sup 5}. This result is between the {1/2} power dependence expected for strain rate control (forced jet impingement) and the 2/3 power expected for buoyancy control of turbulent heat transfer rates.

• OSTI ID: 5316886
• Journal Information: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 109:1; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

570000* -- Health & Safety
99 GENERAL AND MISCELLANEOUS
BENCH-SCALE EXPERIMENTS
BUILDINGS
CEILINGS
CONVECTION
ENERGY TRANSFER
EXHAUST GASES
FIRES
FLUID FLOW
FLUIDS
GASEOUS WASTES
GASES
HEAT FLUX
HEAT TRANSFER
IMPINGEMENT
MASS TRANSFER
NATURAL CONVECTION
NUSSELT NUMBER
PLUMES
REYNOLDS NUMBER
TURBULENT FLOW
WASTES