[M-IS21] Geophysical fluid dynamics-Transfield approach to geoscience

[MIS21-P04] Convection patterns in an internally heated fluid layer with background rotation

*Yuji Tasaka¹, Daisuke Noto¹, Takatoshi Yanagisawa² (1.Faculty of Engineering, Hokkaido University, 2.Japan Agency for Marine-Earth Science and Technology)

Keywords:Convection pettern, Internally heated layer, Background rotation

Natural convection induced by internal heat source in a horizontal fluid layer has been studied as a model of convections in fluid layers with asymmetric temperature profiles in the gravity direction. We reported results of the experimental investigation for pattern formation of internal heating convection with background rotation. Three types of visualization experiment, shear field by flake particles, temperature field by micro capsules of temperature chromic liquid crystal, and velocity vector field by particle imaging velocimetry, elucidated the convection pattern transition in parameter fields with Rayleigh number and Taylor number. The regime map represents that the transition from large, quasi-polygonal cells usually observed in the internally heated convection to small, quasi-regular cells is organized by Rossby number. In addition to these, a new regime termed descending sheet convection was observed at relatively large Rayleigh numbers. Additional scaling analysis tried to explain size variation of the convection patterns with respect to Rossby number.