Experimental Investigation Of Heat Transport Of Rayleigh-Bénard Convection With Partitioned Cells And Ring-shape Cell

The first experiment of this thesis is about the influence of heat trans-port in the turbulent Rayleigh-Benard convection by partitioned cells.With water as the working fluid,we investigated the efficiency of the global heat transport of the system.The size of the cell is 50.0x15.0 x 10.0cm3.We changed the number of partition walls n=8,18,24,28,32 and the gap between the plates and the partition walls d=lmm,3mm.With high-precision ther-mistors,our experiments covered the Rayleigh number from 2.06×107 to 7.73 x 108 and the Prandtl number from 5.2 to 5.4.Our results showed that the heat transport enhancement is increased monotonously with the increase of n.At Ra=108,the ratio of Nu(n)to Nu(0)is very similar with Yun Bao's simulation results as the n changes.We presented an experimental investigation of the impact of the ring-shape cell to the heat transfer of the Rayleigh-Benard convection in the second part of the thesis.Degassed water is used as the working fluid and the diameters of the ring are 272mm and 190mm.The Prandtl number is fixed at 4.3,the range of the Rayleigh number is from 3.22×108 to 5.6×109.The results showed that this ring-shape cell barely influents the heat trans-fer of the system and the data almost agree with those of Funfschilling[2].