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 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)

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

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

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

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

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

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

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

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

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

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

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 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

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

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 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

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

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

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

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]:

The mathematical model of two-dimensional unsteady-state heat conduction without internal heat source is expressed as follows where is the Dirichlet (first-type) boundary condition is the Neumann (second-type) boundary condition is the Robin (third-type) boundary condition and is

2020-4-8Thermal radiation effect on flow and heat transfer of unsteady MHD micropolar fluid over vertical heated nonisothermal stretching surface using I A HASSANIEN 1 H M EL-HAWARY 1 M A A MAHMOUD 2 R G ABDEL-RAHMAN 2 A S ELFESHAWEY 2

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