Thermal management of a symmetrically heated channel-chimney system

被引：23
作者：
Andreozzi, Assunta [1 ]
Buonomo, Bemardo [2 ]
Manca, Oronzio [2 ]
机构：
[1] Univ Naples Federico II, Dipartimento Energet Termofluidodinam Applicata &, I-80125 Naples, Italy
[2] Univ Naples 2, Dipartimento Ingn Aerospaziale Meccan, I-81031 Aversa, CE, Italy
来源：
INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2009年 / 48卷 / 03期
关键词：
Thermal management; Natural convection; Vertical channel-chimney system; Thermal optimization; Thermal design; CONSTRUCTAL MULTISCALE STRUCTURE; VERTICAL PARALLEL PLATES; NATURAL-CONVECTION; TRANSFER ENHANCEMENT; SOLAR CHIMNEY;
D O I：
10.1016/j.ijthermalsci.2008.03.017
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A parametric analysis of natural convection in air, in a channel-chimney system, symmetrically heated at uniform heat flux, obtained by means of a numerical simulation, is carried out. The analyzed regime is two-dimensional, laminar and steady-state. Results are presented in terms of wall temperature profiles in order to show the more thermally convenient configurations which correspond to the channel-chimney system with the lowest maximum wall temperature. For the considered Rayleigh number, the difference between the highest and the lowest maximum wall temperatures increases with increasing the channel aspect ratio. The optimal expansion ratio values depend strongly on the Rayleigh number and extension ratio values and slightly on the channel aspect ratio. Correlations for dimensionless mass flow rate, maximum wall temperature and average Nusselt number, in terms of Rayleigh number and dimensionless geometric parameters are presented in the ranges: 5 <= Ra* <= 2.0 x 10(4), 1.5 <= L/L-h <= 4.0 and 1.0 <= B/b <= 4.0. (C) 2008 Elsevier Masson SAS, All rights reserved.
引用
收藏
页码：475 / 487
页数：13
相关论文
共 31 条
[1]  
ANDREOZZI A, 2005, NUMER HEAT TR A-APPL, V47, P1
[2]   Compounded natural convection enhancement in a vertical parallel-plate channel [J].
Andreozzi, Assunta ;
Campo, Antonio ;
Mancac, Oronzio .
INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 2008, 47 (06) :742-748
[3]  
[Anonymous], ASME HTD
[4]   NATURAL-CONVECTION IN A VERTICAL HEATED TUBE ATTACHED TO A THERMALLY INSULATED CHIMNEY OF A DIFFERENT DIAMETER [J].
ASAKO, Y ;
NAKAMURA, H ;
FAGHRI, M .
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 1990, 112 (03) :790-793
[5]   Thermal design of symmetrically and asymmetrically heated channel-chimney systems in natural convection [J].
Auletta, A ;
Manca, O ;
Musto, M ;
Nardini, S .
APPLIED THERMAL ENGINEERING, 2003, 23 (05) :605-621
[6]   Heat and fluid flow resulting from the chimney effect in a symmetrically heated vertical channel with adiabatic extensions [J].
Auletta, A ;
Manca, O .
INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 2002, 41 (12) :1101-1111
[7]   Heat transfer enhancement by the chimney effect in a vertical isoflux channel [J].
Auletta, A ;
Manca, O ;
Morrone, B ;
Naso, V .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2001, 44 (22) :4345-4357
[8]   Study of the natural convection phenomena inside a wall solar chimney with one wall adiabatic and one wall under a heat flux [J].
Bacharoudis, Evangellos ;
Vrachopoulos, Michalis Gr. ;
Koukou, Maria K. ;
Margaris, Dionysios ;
Filios, Andronikos E. ;
Mavrommatis, Stamatis A. .
APPLIED THERMAL ENGINEERING, 2007, 27 (13) :2266-2275
[9]   Constructal multi-scale structure for maximal heat transfer density [J].
Bejan, A ;
Fautrelle, Y .
ACTA MECHANICA, 2003, 163 (1-2) :39-49
[10]  
Bejan A, 2000, Shape and structure: from engineering to nature
1234