arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2008.02193math.APmath.OC
收藏

带Robin边界条件的绝热最优化问题

An optimization problem in thermal insulation with Robin boundary conditions

Francesco Della Pietra, Carlo Nitsch, Riccardo Scala, Cristina Trombetti

摘要:

研究了有界体$Ω\subset \mathbb{R}^n$的绝热性。根据规定的热源$f\geq 0$,我们考虑一个模型之间的热传递$Ω$和由对流确定的环境,这对应于,绝缘前,罗宾边界条件。然后用厚度为$\varepsilon>0$的绝缘材料层包围该主体,并且该绝缘材料层的电导率也与$\varepsilon$成比例。这对应于少量绝缘材料的情况,具有优异的绝缘性能。然后我们计算了能量泛函$F_\varepsilon$的$Γ$ -极限,并证明了这是一个泛函$F$,其极小元仍然满足椭圆型偏微分方程系统的非均匀Robin边界条件,该边界条件依赖于绝缘层在$Ω$周围的分布.在第二步中,我们研究的最大化的热含量(衡量良好的绝缘)之间的所有可能的分布的绝缘材料与固定的质量,并证明了一个最佳的上界的几何性质。最后,我们证明了一个猜想,即球周围均匀分布的绝缘材料的热含量最大化。

英文摘要:

We study thermal insulating of a bounded body $Ω\subset \mathbb{R}^n$. Under a prescribed heat source $f\geq 0$, we consider a model of heat transfer between $Ω$ and the environment determined by convection; this corresponds, before insulation, to Robin boundary conditions. The body is then surrounded by a layer of insulating material of thickness of size $\varepsilon>0$, and whose conductivity is also proportional to $\varepsilon$. This corresponds to the case of a small amount of insulating material, with excellent insulating properties. We then compute the $Γ$-limit of the energy functional $F_\varepsilon$ and prove that this is a functional $F$ whose minimizers still satisfy an elliptic PDEs system with a non uniform Robin boundary condition depending on the distribution of insulating layer around $Ω$. In a second step we study the maximization of heat content (which measures the goodness of the insulation) among all the possible distributions of insulating material with fixed mass, and prove an optimal upper bound in terms of geometric properties. Eventually we prove a conjecture which states that the ball surrounded by a uniform distribution of insulating material maximizes the heat content.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑