title: Prandtl-, Rayleigh-, and Rossby-number dependence of heat transport in turbulent rotating Rayleigh-Bénard convection.
abstract: Experimental and numerical data for the heat transfer as a function of the Rayleigh, Prandtl, and Rossby numbers in turbulent rotating Rayleigh-Bénard convection are presented. For relatively small Ra approximately 10(8) and large Pr modest rotation can enhance the heat transfer by up to 30%. At larger Ra there is less heat-transfer enhancement, and at small Pr less, similar 0.7 there is no heat-transfer enhancement at all. We suggest that the small-Pr behavior is due to the breakdown of the heat-transfer-enhancing Ekman pumping because of larger thermal diffusion.
authors.affiliation: Department of Physics and iQCD, University of California, Santa Barbara, California 93106, USA.
authors.forename: Jin-Qiang
authors.initials: JQ
authors.lastname: Zhong
authors.forename: Richard J A M
authors.initials: RJ
authors.lastname: Stevens
authors.forename: Herman J H
authors.initials: HJ
authors.lastname: Clercx
authors.forename: Roberto
authors.initials: R
authors.lastname: Verzicco
authors.forename: Detlef
authors.initials: D
authors.lastname: Lohse
authors.forename: Guenter
authors.initials: G
authors.lastname: Ahlers