Optimal cooling of an internally heated disc

被引:7
作者
Tobasco, Ian [1 ]
机构
[1] Univ Illinois, Dept Math Stat & Comp Sci, Chicago, IL 60607 USA
来源
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2022年 / 380卷 / 2225期
基金
美国国家科学基金会;
关键词
heat transfer; convective cooling; optimal design; variational bounds; branching flows; RAYLEIGH-BENARD CONVECTION; ENERGY-DISSIPATION; OPTIMAL-DESIGN; INCOMPRESSIBLE FLOWS; VARIATIONAL BOUNDS; TOPOLOGY OPTIMIZATION; TRANSPORT; RELAXATION; CONSTANTIN; MODEL;
D O I
10.1098/rsta.2021.0040
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Motivated by the search for sharp bounds on turbulent heat transfer as well as the design of optimal heat exchangers, we consider incompressible flows that most efficiently cool an internally heated disc. Heat enters via a distributed source, is passively advected and diffused, and exits through the boundary at a fixed temperature. We seek an advecting flow to optimize this exchange. Previous work on energy-constrained cooling with a constant source has conjectured that global optimizers should resemble convection rolls; we prove one-sided bounds on energy-constrained cooling corresponding to, but not resolving, this conjecture. In the case of an enstrophy constraint, our results are more complete: we construct a family of self-similar, tree-like 'branching flows' whose cooling we prove is within a logarithm of globally optimal. These results hold for general space- and time-dependent source-sink distributions that add more heat than they remove. Our main technical tool is a non-local Dirichlet-like variational principle for bounding solutions of the inhomogeneous advection-diffusion equation with a divergence-free velocity.This article is part of the theme issue 'Mathematical problems in physical fluid dynamics (part 1)'.
引用
收藏
页数:33
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