Influence of aspect ratio in convection due to nonuniform heating
نویسندگان
چکیده
The influence of fluid depth in a convection problem in which heating is nonuniform is studied. We consider a vessel that has at the bottom a temperature distribution which has Gaussian shape in the transversal direction and whose surface is open to the atmosphere. Coupled buoyancy and thermocapillary effects are taken into account. The results confirm a stationary bifurcation and a prelude of an oscillatory one as has been observed recently in convection with quasi-one-dimensional heaters. @S1063-651X~98!09506-3#
منابع مشابه
Free convection in a 3D chamber with local cooling and heating
This paper modeled heating air of a room through examining free convection in a 3D chamber. The chamber had cold and hot sources with Tc and Th temperatures, respectively. Its other walls were adiabatic. This study aimed at predicting effect of temperature difference, displacement of hot and cold sources and their aspect ratio on flow field, temperature and heat transfer rate. To conduct the st...
متن کاملNumerical Study of Mhd Natural Convection in an Inclined Rectangular Cavity with Internal Heat Generation Filled with a Porous Medium under the Influence of Joule Heating
Using an implicit finite difference method, the effect of Joule heating on the magnetohydrodynamic natural convection in an inclined rectangular enclosure with internal heat generation has been performed. The left and right walls of the enclosure are maintained at a constant temperature while the bottom and top walls are kept insulated. The values of the governing parameters are the Hartmann nu...
متن کاملMixed Convection Flow in a Rectangular Ventilated Cavity with a Heat Conducting Solid Circular Cylinder at the Center
A numerical investigation has been carried out for mixed convection flow in a rectangularventilated cavity with a heat conducting solid circular cylinder at the center. Forced convection flowconditions were imposed by providing an inlet at the bottom of the left wall and an outlet vent at the topto the other sidewall. In this paper, the effect of cavity aspect ratio as well as the mixed convect...
متن کاملMeasurements of the instantaneous local heat flux in turbulent Rayleigh–Bénard convection
We present measurements of the instantaneous local heat flux in highly turbulent Rayleigh–Bénard (RB) convection in air (Pr = 0.7) for aspect ratios in the range 1.136 0 6 9.00 and for Rayleigh numbers in the range 1.3× 109 6 Ra 6 9.6× 1011. The measurements have been carried out simultaneously at the surfaces of the heating and the cooling plate using a commercial sensor whose diameter is 360 ...
متن کاملResonant Response of Deep Convection to Surface Hot Spots
Observations show substantial variations of the intensity of tropical and/or summertime deep convection on land that are not explained by standard measures of convective instability. One feature that distinguishes land surfaces is their heterogeneity. The possible importance of this is investigated here by calculating the response of a nonrotating atmosphere to localized, transient surface heat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998