mathematical model of unsteady heat transfer

unsteady heat transfer

2018-10-1Based on the house with reinforced concrete and inner thermal insulation for external wall and ceramsite concrete for internal wall that is common in newly building houses at present this paper establishes the mathematical model of room unsteady heat transfer at the heating calculating temperature out of the door

Unsteady heat transfer performance of heat pipe with

A mathematical model is developed for predicting the transient heat transfer and fluid flow of heat pipe with axially swallow-tailed microgrooves The effects of liquid convective heat transfer in the microgrooves liquid-vapor interfacial phase-change heat transfer and liquid-vapor interfacial shear stress are accounted for in the present model

Unsteady State Heat Transfer

2020-7-31UNSTEADY STATE HEAT TRANSFER Heat transfer processes are prominent in engineering due to several applications in industry and environment Heat transfer is central to the performance of propulsion systems design of conventional space and water heating systems cooling of electronic equipment and many manufacturing processes (Campos 3)

Computational modelling of MHD unsteady flow and

The MHD heat and mass transfer in a flow of viscous incompressible fluid past an infinite vertical plate has been studied by Singh and Singh (2003) Ali and Magyari (2007) reported a numerical solution for unsteady boundary layer flow and heat transfer induced by a submerged stretching surface while its steady motion is slowed down gradually

Numerical Simulation of Wave Formation and Heat Transfer

2020-2-17Numerical Simulation of Wave Formation and Heat Transfer in Falling Liquid Films at Unsteady Heat Release Journal of Engineering Thermophysics ( IF 1 163) DOI: A N Chernyavskiy A N Pavlenko Abstract The presented mathematical model enables calculation of the wave surface profile as well as the fields of velocity and temperature in falling wavy liquid films

ANALYTICAL HEAT TRANSFER

2017-6-2These are lecture notes for AME60634: Intermediate Heat Transfer a second course on heat transfer for undergraduate seniors and beginning graduate students At this stage the student can begin to apply knowledge of mathematics and computational methods to the problems of heat transfer Thus

Unsteady heat transfer in heat pipes

The purpose was to investigate the unsteady heat transfer associated with a heat pipe during start up operation Initial studies were conducted with a variety of heat pipe screen wick configurations in order to develop a mathematical expression for the flow velocity of a fluid inducted by the capillary structure of the wick This mathematical model was solved first numerically and then

Effect of Magnetic Field on the Flow and Heat

Megahed [31] examined the impact of variable heat flux viscous heating and velocity slip flow on the heat transfer of a Casson fluid in thin film on a stretching sheet In this paper influence of magnetic field on the thin film flow and heat transfer of a Casson fluid over an unsteady stretching sheet is investigated

A mathematical model of drying for hygroscopic

A mathematical model is developed to simulate the drying of hygroscopic porous media and in particular of wood Drying rate experiments were performed using wood specimens and a nonhygroscopic porous ceramic solid and were simulated using the appropriate version of the drying model

Unsteady heat transfer performance of heat pipe with

A mathematical model is developed for predicting the transient heat transfer and fluid flow of heat pipe with axially swallow-tailed microgrooves The effects of liquid convective heat transfer in the microgrooves liquid-vapor interfacial phase-change heat transfer and liquid-vapor interfacial shear stress are accounted for in the present model

Numerical simulation of multi

2017-11-24The aim of this paper is to study the spray cooling heat transfer characteristics using CFD method The two phase mathematical model is established based on Euler-Lagrange approach In this model unsteady-state flow conditions are simulated Heat and

Unsteady heat transfer performance of heat pipe with

A mathematical model is developed for predicting the transient heat transfer and fluid flow of heat pipe with axially swallow-tailed microgrooves The effects of liquid convective heat transfer in the microgrooves liquid-vapor interfacial phase-change heat transfer and liquid-vapor interfacial shear stress are accounted for in the present model

Mathematical model of the liquefied methane phase

The article presents a model of unsteady heat and mass transfer of a two-phase liquefied methane medium in a developed two-tank cryogenic tank using a Cartesian coordinate system with fractional control volumes in space The experimental data confirm the efficiency of using a cryogenic tank on the VEH platform in which the run on liquefied

3d Heat Transfer Matlab Code

18 December 18 2014 at 4:50 pm The attached files contain source code as well as a sample MATLAB ( Mini Refprop Matlab The implementation details are described in P A heat transfer model for grinding has been developed based on the finite difference method (FDM) To assist drawing the axes are rescaled by Radiative Heat Transfer 2nd Ed

Heat transfer and entropy analysis of Maxwell hybrid

In this numerical study researchers explore the flow heat transfer and entropy of electrically conducting hybrid nanofluid over the horizontal penetrable stretching surface with velocity slip conditions at the interface The non-Newtonian fluid models lead to better understanding of flow and heat transfer characteristics of nanofluids

Heat Exchanger Matlab Simulink Model

Heat Exchangers Matlab/Simulink model run A heat exchanger is a device used to transfer heat between a solid object and a fluid or between two or more fluids pressure drop and heat transfer rate BACKGROUND A heat exchanger is a heat transfer device whose purpose is the transfer of energy from one moving fluid stream to another moving fluid

EXPERIMENTAL VERIFICATION OF MATHEMATICAL

2011-11-29used for verification of the mathematical model of unsteady heat transfer in exhaust systems Comparisons between experimental results and the mathematical model are presented in this paper Based on obtained results it can be concluded that there is a good agreement between the model and the experimental results

Unsteady Convection Flow and Heat Transfer over a

2014-9-29The Construction and Analysis of the Model Consider convection and heat transfer of the unsteady two-dimensional incompressible viscous fluid flow along a vertical permeable sheet in a porous medium The origin of the Cartesian coordinates is the slot position which is shown in Fig 1

Generalized numerical modelling of unsteady heat

A mathematical model is developed for determination of the unsteady-state temperature and enthalpy fields (as well as the space-time evolution of the phase content) and of the cooling and freezing (heating and thawing) times of food materials and other bodies of various configurations (representing multicomponent two-phase systems having one

Mathematical modeling of unsteady heat exchange in

Mathematical modeling of unsteady heat exchange in a passenger car was made by the elementary balance method Practical value Created mathematical model gives the possibility to simulate temperature changes in passenger car on unsteady thermal conditions with enough accuracy and to introduce and remove additional elements to the designed model

MHD Heat and Mass Transfer of the Unsteady Flow of a

2017-4-21MHD Heat and Mass Transfer of the Unsteady Flow of a Maxwell Fluid 2171 MATHEMATICAL FORMULATION: Consider the unsteady two dimensional MHD flows of a Maxwell fluid over a stretching surface which coincides with the plane y = 0

Numerical solution of three dimensional unsteady

The problem of biomagnetic fluid flow and heat transfer in the three-dimensional unsteady stretching/shrinking sheet is examined Our model is the ver-sion of biomagnetic fluid dynamics (BFD) which is consistent with the principles of ferrohydrodynamics (FHD) Our

Unsteady Boundary Layer Flow and Heat Transfer of a

2014-10-10Mathematical Formulation Let us consider the heat transfer effect on unsteady boundary layer flow in a Casson fluid past an infinite oscillating vertical plate fixed at the flow being confined to where is the coordinate axis normal to the plate Initially for time both plate and fluid are at stationary condition with the constant temperature

NUMERICAL COMPUTATION OF UNSTEADY HEAT

2011-1-19Numerical Computation of Unsteady Heat Transfer through Powder Grain 281 temperature Tbs changes are very small Figure 1 shows powder grain with radius rb and middle temperature Tbs which is in gas with temperature Tg Initial temperature in grain center is Tb0 a) Temperature profile in powder grain can be presented as [6]: