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Thèses sur le sujet « Convective mixers »

Auteur : Grafiati

Publié le 14 décembre 2024

Mis à jour le 31 juillet 2025

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1

Boussoffara, Hayfa. "Multi-scale powder rheology in convective mixers." Electronic Thesis or Diss., Ecole nationale des Mines d'Albi-Carmaux, 2024. http://www.theses.fr/2024EMAC0006.

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Comprendre le comportement d'écoulement des poudres lors de l'agitation mécanique est crucial pour optimiser les processus de mélange dans les applications industrielles. Cette étude introduit la rhéologie μ(I), une loi rhéologique développée pour analyser la rhéologie des poudres dans les écoulements denses au sein d'un dispositif de mélange en laboratoire. Le cadre se concentre sur les interactions entre les pales et le lit de poudre, en abordant les défis de mesure de paramètres complexes des poudres tels que le coefficient de friction effectif µeff. La rhéologie μ(I), développée grâce à l'

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2

Ramesh, Chandra D. S. "Turbulent Mixed Convection." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/236.

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Turbulent mixed convection is a complicated flow where the buoyancy and shear forces compete with each other in affecting the flow dynamics. This thesis deals with the near wall dynamics in a turbulent mixed convection flow over an isothermal horizontal heated plate. We distinguish between two types of mixed convection ; low-speed mixed convection (LSM) and high-speed mixed convection (HSM). In LSM the entire boundary layer, including the near-wall region, is dominated by buoyancy; in HSM the near-wall region, is dominated by shear and the outer region by buoyancy. We show that the value of th

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3

Ramesh, Chandra D. S. "Turbulent Mixed Convection." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/236.

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Turbulent mixed convection is a complicated flow where the buoyancy and shear forces compete with each other in affecting the flow dynamics. This thesis deals with the near wall dynamics in a turbulent mixed convection flow over an isothermal horizontal heated plate. We distinguish between two types of mixed convection ; low-speed mixed convection (LSM) and high-speed mixed convection (HSM). In LSM the entire boundary layer, including the near-wall region, is dominated by buoyancy; in HSM the near-wall region, is dominated by shear and the outer region by buoyancy. We show that the value of th

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4

Kuhn, Simon. "Transport mechanisms in mixed convective flow over complex surfaces." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17627.

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5

Gokhale, Prasad N. "Mixed convective heat transfer and evaporation at the air-water interface." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202500424/.

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6

Cotton, M. A. "Theoretical studies of mixed convection in vertical tubes." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378014.

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7

Kalapurakal, Dipin. "Numerical Simulation of Magnetohydrodynamic (MHD) Effect on Forced, Natural and Mixed Convection Flows." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342115168.

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8

Lagana, Anthony. "Mixed convection heat transfer in vertical, horizontal, and inclined pipes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq29607.pdf.

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9

Lagana, Anthony. "Mixed convection heat transfer in vertical, horizontal, and inclined pipes." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27234.

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An experimental apparatus was designed and constructed for the study of laminar mixed convection heat transfer in vertical, horizontal and inclined tubes. The working fluid was distilled water, with bulk temperatures in the range of 8$ sp circ$C to 31$ sp circ$C.<br>An innovative design allows, for the first time, flow visualization over the entire heated portion of the test section. The key element of this design is a thin, electrically conductive gold-film heater suitably attached to the outside surface of a plexiglas pipe: the gold film is approximately 80% transparent to electromagnetic ra

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10

Yu, L. S. L. "A computational study of turbulent mixed convection in vertical tubes." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493722.

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11

Moresco, Pablo Diego. "Linear and weakly nonlinear stability of mixed convection boundary layers." Thesis, Keele University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325859.

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12

Marsh, Jesse B. (Jesse Benjamin). "Mixed convection and heat management in the Mars gravity biosatellite." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40453.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (leaves 28-29).<br>The Mars Gravity Biosatellite will house fifteen mice in a low Earth orbit satellite spinning about its longitudinal axis. The satellite's payload thermal control system will reject heat through the base of the payload module and provide air circulation vital to maintaining a habitable environment for the mice. The centripetal acceleration due to rotation creates the tendency for heated air to move by free convection toward the axis of rotation.

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13

Walton, Andrew. "Mixed convection heat transfer to sodium in a vertical pipe." Thesis, University of Manchester, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.762614.

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14

Tomarchio, Valerio <1978&gt. "Magnetohydrodynamic Effects On Mixed Convection Flows In Channels And Ducts." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1411/1/tomarchio_valerio_tesi.pdf.

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This work focuses on magnetohydrodynamic (MHD) mixed convection flow of electrically conducting fluids enclosed in simple 1D and 2D geometries in steady periodic regime. In particular, in Chapter one a short overview is given about the history of MHD, with reference to papers available in literature, and a listing of some of its most common technological applications, whereas Chapter two deals with the analytical formulation of the MHD problem, starting from the fluid dynamic and energy equations and adding the effects of an external imposed magnetic field using the Ohm's law and the definiti

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15

Tomarchio, Valerio <1978&gt. "Magnetohydrodynamic Effects On Mixed Convection Flows In Channels And Ducts." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1411/.

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This work focuses on magnetohydrodynamic (MHD) mixed convection flow of electrically conducting fluids enclosed in simple 1D and 2D geometries in steady periodic regime. In particular, in Chapter one a short overview is given about the history of MHD, with reference to papers available in literature, and a listing of some of its most common technological applications, whereas Chapter two deals with the analytical formulation of the MHD problem, starting from the fluid dynamic and energy equations and adding the effects of an external imposed magnetic field using the Ohm's law and the definiti

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16

Delmas, Agnès. "Convection naturelle et forcée dans des systèmes mixtes milieu fluide, milieu poreux." Bordeaux 1, 1989. http://www.theses.fr/1989BOR10542.

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On etudie les conditions dans lesquelles un ecoulement de convection peut penetrer un milieu poreux et les consequences que cette circulation engendre sur les transferts thermiques. Etude theorique a partir d'une approche de type couche limite. Mesure de la vitesse, des temperatures et des flux thermiques dans une cavite rectangulaire partiellement occupee par un isolant fibreux

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17

Ro, Tae Sun. "Porous body analysis of vertical rod bundles under mixed convection conditions." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/14988.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.<br>Bibliography: leaves 322-326.<br>by Tae Sun Ro.<br>Ph.D.

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18

FANG, YUANXIANG. "NEW DEVELOPMENTS OF BIOTRICKLING FILTERS: EXPERIMENTS AND THEORIES." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1017955104.

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19

Walsh, Jennifer Kathleen. "Thermophoretic deposition of aerosol particles in laminar tube flow with mixed convection." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3178344.

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20

Al-Khafaji, Ali Khaleel Kareem. "Mixed convection heat transfer enhancement in lid-driven cavities filled with nanofluids." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42841.

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Mixed convection heat transfer in enclosures has been studied in order to enhance the associated heat transfer performance through the use of either different convective fluid types, domain configurations, boundary conditions, or combinations thereof. Analysing the enhancement in heat transfer has been accomplished through the isotherm and streamline contours, temperature isosurfaces, flow vectors, mean and root mean square velocity profiles, turbulence kinetic energy profiles and Nusselt number profiles. Firstly, laminar mixed convection in a lid-driven trapezoidal cavity using different nano

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21

Iannello, Victor. "Mixed convection in vertical parallel channels connected at upper and lower plena." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15064.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE<br>Bibliography: v.1, leaves 287-292.<br>by Victor Iannello.<br>Sc.D.

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22

Lee, Jeongik. "The flow structure under mixed convection in a uniformly heated vertical pipe." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34449.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2005.<br>Includes bibliographical references (p. 79-84).<br>For decay heat removal systems in the conceptual Gas-cooled Fast Reactor (GFR) currently under development, passive emergency cooling using natural circulation of a gas at an elevated pressure is being considered. Since GFR cores have high power density and low thermal inertia, relative to the high temperature gas-cooled thermal reactor (HTGR), the decay heat removal (DHR) in depressurization accidents is a major challenge to be overcome. This is due t

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23

Johnston, S. E. "Investigation of heat transfer in liquid sodium under conditions of mixed convection." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376135.

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24

Barbosa, Saldana Juan Gabriel. "Numerical simualtion of mixed convection over a three-dimensional horizontal backward-facing step." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/2353.

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A FORTRAN code was developed to numerically simulate the mixed convective flow over a three-dimensional horizontal backward-facing step. The momentum and energy equations under the assumption of the Boussinesq approximation were discretized by means of a finite volume technique. The SIMPLE algorithm scheme was applied to link the pressure and velocity fields inside the domain while an OpenMP parallel implementation was proposed to improve the numerical performance and to accelerate the numerical solution. The heating process corresponds to a channel heated from below at constant temperature ke

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25

Busedra, Abdulkarim A. "Laminar mixed convection in inclined semicircular ducts under buoyancy-assisted and -opposed conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0020/NQ44992.pdf.

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26

Westhoff, Andreas. "Spatial Scaling of Large-Scale Circulations and Heat Transport in Turbulent Mixed Convection." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://hdl.handle.net/11858/00-1735-0000-000D-FD19-2.

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27

Chen, Shih-Tsung, and 陳思璁. "Mixed Convective Wall Plume along a Horizontal Adiabatic Plate." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/32907457851416495801.

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28

Huang, Ting-Ming, and 黃鼎名. "Mixed convection flow and heat transfer." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/24983879601442927041.

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29

馮益坤. "Simulation af mixed convective air flow over a horizontal plate." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/39483528957301132455.

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30

Gavara, Madhusudhana Rao. "Role Of Mixed Convection In Cooling Of Electronics." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/1091.

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Cooling of electronic components is one of the most important issues concerned in the electronic industry for design of equipment. Maintaining the temperature of an electronic device within its safe operating temperature limits is essential to operate the equipment safely with proper functionality. According to the Arrhenious law of failure rate, for a device with activation energy 0.65eV, every 10°C increase in temperature doubles the failure rate. Recent miniaturisation of components and high device heat dissipation rates lead to high heat fluxes, which cause temperature rise. Hence, there i

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31

Gavara, Madhusudhana Rao. "Role Of Mixed Convection In Cooling Of Electronics." Thesis, 2009. http://hdl.handle.net/2005/1091.

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Cooling of electronic components is one of the most important issues concerned in the electronic industry for design of equipment. Maintaining the temperature of an electronic device within its safe operating temperature limits is essential to operate the equipment safely with proper functionality. According to the Arrhenious law of failure rate, for a device with activation energy 0.65eV, every 10°C increase in temperature doubles the failure rate. Recent miniaturisation of components and high device heat dissipation rates lead to high heat fluxes, which cause temperature rise. Hence, there i

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32

SHAO, HUI-ZHOU, and 邵揮洲. "Study on the natural and mixed convective heat reansfer in confined regions." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/50791086896677912955.

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33

Wang, Lv-Gong, and 王履功. "Numerical investigation of mixed convective air flow over an inclined flat plate." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/37515728907517157002.

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34

Lin, Yan Huai, and 林彥懷. "Convective Heat Transfer of Mixed Electroosmotic and Pressure-Driven Flow in Microchannels." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/zf9354.

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碩士<br>國立虎尾科技大學<br>機械與機電工程研究所<br>98<br>This study is aimed to treat the problem of convective heat transfer introduced by combined electrokinetic and pressure forces in microchannels. Analytical solution are presented for a slit microchannel with constant surface temperature, taking into account the effect of joule heating and viscous dissipation for different Peclet number. First , the Poisson-Boltzmann equation is solved to obtain the electrokinetic potential. Next, the fluid velocity distribution across the channel is determined form the momentum equation. Finally, we solve the energy equati

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35

Jian, Wei-Li, and 簡偉立. "Mixed Convection from Combined Heat and Mass Transfer." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/03802733959622276545.

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碩士<br>國立中央大學<br>化學工程學系<br>84<br>This paper studied laminar mixed convection from combined heat and mass transfer. The investigated system are vertical and horizontal plates which are maintained with uniform temperature and concentration. The case of plates maintained with uniform fluxes of heat and spesies are also included. By introducing some proper dimensionless variables and parameters from scale analysis, the governing equations can be transformed

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Wang, Jin Cheng, and 王進成. "Laminar MHD mixed convection in a vertical channel." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/73999319606316037527.

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碩士<br>國立暨南國際大學<br>土木工程學系<br>94<br>Abstract The study of combined free and forced magnetohydrodynamic convection flow between two parallel vertical plates is performed by taking into account the effects of internal heat source, viscous dissipation and ohmic heating. The channel boundaries are kept isothermal and maintained at either equal or at different temperature. The velocity and temperature fields are solved analytically by perturbation series method and numerically by the foruth-order Runge-Kutta shooting technique together with the Newton-Raphson scheme to satisfy the boundary conditi

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37

YI, ZHI-PING, and 尹治平. "Transient laminar mixed convection in a vertival channel." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/67983241203019790669.

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38

Liu, Kuan-Lan, and 劉冠蘭. "Analysis of Mixed Convection at High Richardson Number." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/27671015321731835004.

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碩士<br>國立交通大學<br>機械工程學系<br>99<br>An investigation of heat transfer in a three-dimensional tapered chimney with consideration of the flow compressibility is studied numerically.The finite difference method is adopted and the computational approaches are divided into two parts. One is the Roe scheme applied for the flux of inviscid terms and the preconditioning matrix is added for the efficiency in all speed fields. The other one is the central difference method of second order utilized to solve viscous terms. The temporal term is solved by LUSGS. Non-reflection conditions at the outlet is derive

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39

Wang, Yen-Chan, and 王衍展. "Study of Mixed Convective Heat Transfer in Porous Channel with Staggered Ribbed Turbulator." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/08326933770648623711.

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碩士<br>建國科技大學<br>機電光系統研究所<br>92<br>The objective of the present work is to study the convective heat transfer in sintered porous channel. The sintered test section is made of three diameters of copper beads of 0.704, 0.830 and 1.163 mm. The characteristics of the wall temperature distribution with constant heat flux were measured. This study also reveals that heat transfer coefficients and Nusselt numbers were presented for various Reynolds numbers and heat flux. Use compress air to proceed cooling work fluid, Also facing sintered porous channel weigh rib. Using the Brinkman-extended Darcy mode

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Hsu, Chan-Chang, and 許展彰. "Mixed convective heat transfer in a channel with a periodic oscillating heated block." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34593405020306385750.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>96<br>Mixed convective heat transfer in a channel with a periodic oscillating heated block is numerically investigated in this study. The fluid flows into the channel from the left opening and exits from the opposite end. Both the temperature and velocity of the inflow fluid are kept constant. Periodic oscillating heated block in the center of the channel. The governing equations for micropolur fluid were first presented by A.C. Eringen, wherein we furthermore expend the applications to non-Newtonian fluids. The numerical computations were obtained using the c

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41

Lin, Chien-Ta, and 林鍵達. "The mixed convection of nanofluids in a vertical channel." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/86145136612151236657.

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碩士<br>逢甲大學<br>機械工程學所<br>94<br>This research is to investigate mixed convection heat transfer phenomena of nanofluids in vertical channels by using numerical technique. The CFDRC software in conjunction with the self-developed adjustment subroutines for boundary conditions and for specified thermal properties is applied in this research. The mixed convection heat transfer phenomena of six different nanofluids, Water-Cu, Water-Al2O3, Water-SiO2, Water-TiO2, Engine oil-Cu, and Ethylene glycol-Cu, with various volume fractions, entrance velocities, and wall calefaction conditions are studied in th

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SHI, CHONG-GUANG, and 施重光. "Mixed convection and thermophoresis in a horizontal circular tube." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/24958376569282124710.

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碩士<br>國立成功大學<br>航空太空工程研究所<br>80<br>MCVD製程是目前製造光纖的方法中最廣為採用的方法，其製造成本與反應氣體反應後所產生之粒子的堆積效率有關，如何提高粒子堆積效率是本文探討的課題所在。本文以雷射光束加熱－旋轉圓管，改變雷射強度及電射光束寬度，以及電射的中心位置，並考慮流場高溫時所不能忽略的熱輻射效應。在沒有電射加熱時，探討圓管轉速、入口速度、入口溫度對流場、溫度場和粒子濃度場之影響，尋求一較佳的粒子堆積效的狀況。對圓管旋轉時，在θ方向引入強制對流，使得浮力效應對二次流的影響較小，當轉速為60rpm 和120rpm時溫度場變化不大。當轉速提高為300rpm時，溫度場趨向對稱，使得管壁附近的溫度梯度減小，故粒子堆積效率較低。以雷射光束加熱流場時，雷射強度越大，流場溫度越高，有助於提高粒子堆積效率，並且存在一最佳的雷射光束分佈，而獲得最高的粒子堆積效率。當雷射光束分佈不是十分集中時，雷射中心在管中央時有較高的

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Hsu, Da-Wei, and 徐大為. "Numerical analysis of laminar mixed convection in a channel." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/23675340670826407049.

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碩士<br>國立臺灣海洋大學<br>輪機工程系<br>95<br>Abstract This study numerically investigates the laminar flow for mixed convection heat transfer problem between parallel plates. Constant plate wall temperature and uniform flow entry are assumed. Parameters of Reynolds number, inclined angle, and are varied to obtain the velocity and temperature distributions in the channel. Introducing the dimensionless quantities, the governing equations as well as boundary conditions are first non-dimensionalized. Then, all the equations are written in finite difference forms and simultaneously solved. Employing the tra

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44

Xu, Qing Tang, and 許慶堂. "Mixed convection in an enclosure with blow and suction." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/43380902787825386822.

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45

LIN, YEN-HON, and 林彥宏. "A Transient Mixed Convection of A Second Grade Viscoelastic." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/12997023586500208678.

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碩士<br>中原大學<br>機械工程研究所<br>84<br>A transient mixed convection of a second grade viscoelastic fluid past an inclined backward facing step is studied to reveal combined effects of the Reynolds number, the elastic coefficient and the inclination angle of the channel on the flow and heat transfer. A numerical simulation method is used in the present study. A finite difference method is applied to the stream-vorticity function and energy equations. Related numerical schemes are point and line Gaus

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46

蔡憲坤. "Optimum array of electronic components in mixed convection system." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/77886582934025762044.

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47

林志傑. "Three-Dimensional Mixed Convection betwen Two Horizontal Eccentric Cylinders." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/84203473063407501113.

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碩士<br>國立成功大學<br>航空太空工程學系<br>87<br>Placing the power cable underground is an engineering tendency in the present days, especially in city areas and industrial zones. The constant heat flux is generated from the electrical resistance of the power cable which lies on the bottom of the conduit, while the concrete wall is adiabatic. This configuration does not permit of steady-state solution of a two-dimensional case. Many theoretical and experimental studies on natural convection in horizontal, eccentric annuli have been carried out. In most of these studies, a two-dimensional model w

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Chuang, Jin-Shun, and 莊金順. "Mixed convection in a square enclosure with partition plates." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/96881844529952596403.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>98<br>Mixed convection heat transfer in a square confined enclosure with partition plates is simulated in this study. The cavity is constructed with two adiabatic horizontal walls and two isothermal walls at different temperatures. The CFD scheme is applied to analyze the flow fields in the cavity. This study analyzes the effect configuration of the partition plates in the cavity on the thermal and flow fields. The results of this study reveal that raising of the Reynolds number will increase the strength of the circulation inside the cavity. In addition, chan

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Tarasing, Bhoite Mayur. "Numerical Study Of Laminar And Turbulent Mixed Convection In Enclosures With Heat Generating Components." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/794.

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The problem of laminar and turbulent conjugate mixed convection flow and heat transfer in shallow enclosures with a series of block-like heat generating components is studied numerically for a Reynolds number range of zero (pure natural convection) to typically 106, Grashof number range of zero (pure forced convection) to 1015 and various block-to-fluid thermal conductivity ratios, with air as the working medium. The shallow enclosure has modules consisting of heat generating elements, air admission and exhaust slots. Two problems are considered. In the first problem, the enclosure has free bo

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Tarasing, Bhoite Mayur. "Numerical Study Of Laminar And Turbulent Mixed Convection In Enclosures With Heat Generating Components." Thesis, 2008. http://hdl.handle.net/2005/794.

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Résumé :

The problem of laminar and turbulent conjugate mixed convection flow and heat transfer in shallow enclosures with a series of block-like heat generating components is studied numerically for a Reynolds number range of zero (pure natural convection) to typically 106, Grashof number range of zero (pure forced convection) to 1015 and various block-to-fluid thermal conductivity ratios, with air as the working medium. The shallow enclosure has modules consisting of heat generating elements, air admission and exhaust slots. Two problems are considered. In the first problem, the enclosure has free bo

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