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Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
2009 Vol. 8, nr 1 185-191
EN In the paper mathematical and numerical model of air convection in 3D region is considered. Governing equations of the model are presented. Main assumptions of numerical approach are discussed. Finite Element Method (FEM) with Characteristic Based Split (CBS) scheme is used to solve the problem. Tw[...]
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Przegląd Elektrotechniczny
2008 R. 84, nr 11 134-139
PL Nagrzewanie ciał stałych w nieograniczonych I nieruchomych środowiskach gazowych charakteryzowane jest poprzez konwekcję naturalna i radiację cieplną nawet przy stosunkowo niskich temperaturach. W pracy omówiono łącznie te dwa zjawiska jako konwekcję ogólną opisana ilościowo przy użyciu teoretyczno-[...]
EN Heating of solid bodies in unbounded and unmoving gaseous media is characterized by comparable effects of the natural convection and thermal radiation even at relatively low temperatures. The paper unifies both these phenomena on the basis of the generalized convection that is quantified by an exper[...]
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Archives of Thermodynamics
EN In the paper the authors present a one-dimensional model of two-phase flow and heat transfer in a closed thermosyphon loop. The presented model is based on mass, momentum, and energy balances in the evaporator, rising tube, condenser, and the falling tube. The homogeneous and separate two-phase flow[...]
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International Journal of Applied Mechanics and Engineering
2001 Vol. 6, no 4 913-922
EN This paper describes a theoretical analysis of transient motion of a viscous incompressible fluid in a vertical channel. The motion of the fluid is caused by the buoyancy force arising from the temperature gradient as a result of constant heat flux at one wall and an adiabatic condition on the other[...]
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Applied Mechanics and Engineering
1998 Vol. 3, no 2 287-304
EN A regular parameter perturbation analysis is presented to study the effect of uniform transverse magnetic field with temperature dependent viscosity in micropolar fluids. Four different vertical flows have been analyzed: these adjacent to an isothermal surface, uniform heat flux surface, a plane plu[...]
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Applied Mechanics and Engineering
1998 Vol. 3, no 4 539-552
EN A three-dimensional boundary layer solution is presented for the natural convection in a micropolar fluid in the vicinity of an axisymmetric stagnation point on heated vertical surfaces. The effects of variable viscosity are included. The governing equations for the velocity, microrotation and tempe[...]
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Journal of Theoretical and Applied Mechanics
2014 Vol. 52 nr 3 827--837
EN In this paper, the effects of the number and arrangement of radial fins on laminar natural co- nvection between horizontal circular and square cylinders has been investigated numerically with the lattice Boltzmann method. The Rayleigh number is varied from Ra = 10³ − 10⁶), the number of fins (N = 2 [...]
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Engineering Transactions
EN This paper presents the results of an experimental investigation on a prototype flat passive solar air collector. The collector consists of an aluminum casing, transparent cover, air inlet and outlet channels and a flat absorber plate mounted inside the casing. The design is unique because the cover[...]
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Archives of Mechanics
EN The aim of this paper is to discuss the double-diffusive natural convection in an anisotropic porous medium saturated with a binary fluid. The vertical walls of porous cavity are subjected to uniform temperature and concentration whereas the other surfaces are assumed to be adiabatic and impermeable[...]
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Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
1999 Z. 67 255--264
EN An experimental study of melting of a pure non-metallic material (99% n-octadecane, Pr =~ 50) is reported. The process, affected by natural convection in the liquid and conduction in the solid, occurs inside a rectangular enclosure which two vertical sidewalls are maintained at uniform, but differen[...]
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Structure and Environment
EN The paper presents applications of infrared measurements. It discusses the use of thermovision and CFD method in the analysis of heat transfer in experimental measurement with natural convection.
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2003 Vol. 7, No 3 439-448
EN This paper discusses a numerical model of the heat dissipation processes in an electrical transformer dipped into polymerised resin. The transformer is cooled by both natural convection (via the ambient air) and forced convection (via the water cooling system attached to one of the transformer casin[...]
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Polish Journal of Chemical Technology
EN The current study is a simplification of related components of large floating roof tank and modeling for three dimensional temperature field of large floating roof tank. The heat transfer involves its transfer between the hot fluid in the oil tank, between the hot fluid and the tank wall and between[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN An approximate analytical solution of a two dimensional problem for stationary Navier-Stokes, continuity and Fourier-Kirchhoff equations describing a free convective heat transfer from an isothermal cone is presented. The problem formulation is based on assumptions typical for natural convection: no[...]
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International Journal of Applied Mechanics and Engineering
EN The influence of variable viscosity and a transverse magnetic field on natural convection in micropolar fluids is examined. The fluid viscosity is assumed to vary as an inverse linear function of temperature. Four different vertical flows have been analyzed, those adjacent to an isothermal surface a[...]
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Applied Mechanics and Engineering
1999 Vol. 4, no 4 789-799
EN A similarity solution is presented for the flow of a micropolar fluid along an isothermal vertical plate with an exponentially decaying heat generation term and viscous dissipation. Numerical solutions are obtained for the governing equations. The data for friction factor, Nusselt number and wall co[...]
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Prace Naukowe Politechniki Warszawskiej. Konferencje
2002 T. 3, z. 22 983-990
EN Basic discussion and some nomenclature are given in the relationship to the procedures of validation and verification of computer simulation codes. The main goal of this paper is to illustrate the application of detailed experimental data to compare and validate two selected FEM codes (a problem-ori[...]
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Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
2003 Z. 77 33-39
EN Experiments were performed to investigate heating up processes of fluids in storage tanks under the influence of an external heat sourec. Several teste were carried out both with heating from the bottom an with heating from the side walls. The test tank was equipped with thermocouples for measuring [...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The paper presents the capabilities of open-source programs used for numerical simulation of fluid flow and heat transfer phenomena. These tools are applied for unsteady problems with natural convection and, in particular, the heating of an automotive headlight. To perform these studies, a solver wa[...]
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Polish Journal of Chemical Technology
EN The main focus of the present study is to utilize the artifi cial neural network (ANN) in predicting the natural convection from horizontal isothermal cylinders arranged in vertical and inclined arrays. The effects of the vertical separation spacing to the cylinder diameter ratio (Py/d), horizontal [...]
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