RT Journal Article ID 6d7cf35f44d7f843 A1 Hattori, Yasuo A1 Suto, Hitoshi T1 PIV MEASUREMENT OF THERMAL CONVECTIVE FLOW ABOVE A COOKING OVEN (INSIGHT INTO TURBULENCE STRUCTURE NEAR A HEAT SOURCE) JF Visualization of Mechanical Processes: An International Online Journal JO VMP YR 2012 FD 2013-03-06 VO 2 IS 2 OP 0 K1 buoyancy K1 convective heat transfer K1 flame K1 kitchen K1 plume K1 proper orthogonal decomposition K1 ventilation AB We examine the spatial-development process of a thermally driven flow above the center of a finite-sized heat source, which corresponds to a cooking oven, by using a particle image velocimetry technique. After verifying the accuracy through the comparison with a hot-wire measurement, we investigate the effects of the heat-source thermal conditions on turbulence structures of the flow fields; we carry out three experiments with a gas ring with a heat flux of 2 kW (CaseQ) and an isothermally heated and round-shaped plate with a surface temperature of 373 K (CaseTL) and 473 K (CaseTH). Turbulence structures in the vicinity of the center of a heat source, which are revealed with a proper orthogonal decomposition for instantaneous velocity fields, strongly depend on the thermal condition. The gas ring (CaseQ) leads to inhomogeneous plumes with vortexes, while the isothermally heated plate (CaseTL, CaseTH) causes homogeneous plumes with meandering motions. Despite the apparent differences of turbulence structures near a heat source, the similarity for turbulence statistics of the fully developed plume is preserved among experiments. PB Begell House LK https://www.dl.begellhouse.com/journals/08456987543b9011,68d84f683cf0d938,6d7cf35f44d7f843.html