Abstract
The exchange flow through a horizontal vent linking two compartments (one above the other) is studied experimentally. This exchange is here governed by both the buoyant natural effect due to the temperature difference of the fluids in both compartments, and the effect of a (forced) mechanical ventilation applied in the lower compartment. Such a configuration leads to uni- or bi-directional flows through the vent. In the experiments, buoyancy is induced in the lower compartment thanks to an electrical resistor. The forced ventilation is applied in exhaust or supply modes and three different values of the vent area. To estimate both velocity fields and flow rates at the vent, measurements are realized at thermal steady state, flush the vent in the upper compartment using stereoscopic particle image velocimetry (SPIV), which is original for this kind of flow. The SPIV measurements allows the area occupied by both upward and downward flows to be determined.
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References
Brown WG (1962) Natural convection through rectangular openings in partition—horizontal partitions. Int J Heat Mass Transf 5:869–878
Conover TA, Kumar R, Kapat JS (1995) Buoyant pulsating exchange flow through a vent. J Heat Transf 117:641–648
Cooper LY (1989) Calculation of the flow through a horizontal ceiling/floor vent. National Institute of Standards and Technology, NISTIR 89-4052, Gaithersburg
Cooper LY (1994) Combined buoyancy- and pressure-driven flow through a horizontal vent. National Institute of Standards and Technology, NISTIR 5384, Gaithersburg
Emmons HW, Tanaka T (2002) Buoyant flows through horizontal vents. In: DiNenno PJ (ed) SFPE handbook of fire protection engineering, 4th edn. National Fire Protection Association Press, Quincy, pp 2-44–2-45
Epstein M (1988) Buoyancy driven exchange flow through small openings in horizontal partitions. J Heat Transf 110:885–893
Epstein M, Kenton MA (1989) Combined natural convection and forced flow through small openings in a horizontal partition, with special reference to flows in multicompartment enclosures. J Heat Transf 111:980–987
Heskestad G, Spaulding RD (1991) Inflow of air required at wall and ceiling apertures to prevent escape of fire smoke. Fire Saf Sci 3:919–928
Li Z (2007) Characteristics of buoyancy driven natural ventilation through horizontal openings. PhD Thesis, Aalborg University
Mercer A, Thompson H (1975) An experimental investigation of some further aspects of the buoyancy driven exchange flow between carbon dioxide and air following a depressurization accident in a magnox reactor, part I: the exchange flow in inclined ducts & part II: the purging flow requirements in inclined ducts. J Br Nucl Energy Soc 14:327–340
Tan Q, Jaluria Y (1992) Flow through horizontal vents as related to compartment fire environments. National Institute of Standards and Technology, NIST-GCR-92-607, Gaithersburg
Tan Q, Jaluria Y (2001) Mass flow through horizontal vent in an enclosure due to pressure and density differences. Int J Heat Mass Transf 44:1543–1553
Varrall K, Pretrel H, Vaux S, Vauquelin O (2016) Stereoscopic particle image velocimetry investigation of the bidirectional natural convection flow through a horizontal vent. Fire Technol 52:2027–2041
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Varrall, K., Pretrel, H., Vaux, S. et al. Stereoscopic particle image velocimetry investigations of the mixed convection exchange flow through a horizontal vent. Exp Fluids 58, 151 (2017). https://doi.org/10.1007/s00348-017-2434-7
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DOI: https://doi.org/10.1007/s00348-017-2434-7