This article introduces a methodology for designing the geometry of diffuse-walled radiant enclosures through nonlinear programming. In this application, the enclosure is represented parametrically using B-spline curves, while the radiosity distribution is solved by infinitesimal-area analysis. The enclosure geometry is repeatedly adjusted with a gradientbased minimization algorithm until a nea...

One of the main problems of interval computations is, given a function f(x 1 problem is feasible for linear functions f, but for generic polynomials, it is known to be computationally intractable. Because of that, traditional interval techniques usually compute the enclosure of y, i.e., an interval that contains y. The closer this enclosure to y, the better. It is desirable to describe cases in...

In this study, natural convection in a fluid-filled rectangular enclosure is analyzed using COMSOL? commercial software. The fluid which takes place dielectric liquid called FC-75. Attached to one of the vertical walls an array protrusions, each representing computer chips mounted on printed circuit board. nominal power consumed by chip assumed be 0.35, 1.07, 1.65, and 2.35 W. This corresponds ...

An empirical evaluation of free convective heat transmission was conducted in a rectangular enclosure containing hybrid nanofluid (50% CuO-50% Al2O3)/water linked to PCM-containing wall. The enclosure's left and right surfaces were kept at constant warm cold temperatures, whereas the remaining assumed be isolated. side filled partially with PCM. Several variables examined, such as hot-side temp...

The voltage on a single-turn loop inside an enclosure characterizes the enclosure shielding effectiveness against a lightning insult. In this paper, the maximum induced voltage on a single-turn loop inside an enclosure from lightning coupling to a metal enclosure wall is expressed in terms of two multiplicative factors: (A) the normalized enclosure wall peak penetration ratio (i.e., ratio of th...

─ This paper deals with an impact of receiving antenna placed in a metal enclosure on an electromagnetic field distribution within the enclosure, and thus on its shielding effectiveness. In an experimental setup, a frequently used tool for measuring the electromagnetic field level at certain points within the enclosure is a dipole antenna connected to a measuring instrument via a coaxial cable....