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A simple mathematical model is developed to describe a lost foam casting process. Different aspects of the process such as liquid metal flow transient heat transfer foam degradation and gas elimination were incorporated into this numerical model. Fluid velocity temperature distribution within molten metal and pressure building-up in the mold cavity are predicted as a function of filling

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Jun 05 2016 · This investigation details the development of a simple transient model to predict the bulk toroidal flow fluid temperature of the automotive torque converter based upon an energy balance and the derivation of an overall convective heat transfer correlation for the entire turbomachine. Data collected on a torque converter specific dynamometer setup is used to derive a Nusselt correlation for

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The final model is reduced to axial symmetry for the sake of feasibility with the available computational resources. The convective heat transfer is neglected as it was considered to be of minor importance for the process itself. The geometrical model covers the entire fixed-point cell assembly and distinguishes each of its elements.

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a conjugate heat transfer model where the maximum temperature is intentionally capped at the melting temperature of the refractory material. The melting temperature is approximately 1373 K. The mapping of the heat flux data shows good qualitative comparison between the CFD result and the Thermal Desktop result as shown in Figure 16.

Get Price### 18.3 Transient Heat Transfer (Convective Cooling or Heating)

18. 3 Transient Heat Transfer (Convective Cooling or Heating) All the heat transfer problems we have examined have been steady state but there are often circumstances in which the transient response to heat transfer is critical. An example is the heating up of gas turbine compressors as they are brought up to speed during take-off.

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Transient Heat Transfer Experiment ME 331 Introduction to Heat Transfer June 1st 2017 . This heat transfer coefficient is related to the predicted convection heat transfer rate increased effect of radiation heat loss. Since the lumped capacitance model is

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Transient Heat Transfer Experiment ME 331 Introduction to Heat Transfer June 1st 2017 . This heat transfer coefficient is related to the predicted convection heat transfer rate increased effect of radiation heat loss. Since the lumped capacitance model is

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model for transient one-dimensional heat conduction. The physical situation is depicted in Figure 1. A sphere of uniform material is initially at a uniform temperature T i. At time t= 0 the sphere is immersed in a stream of moving uid at some di erent temperature T 1. The external surface of the sphere ex-changes heat by convection. The local heat

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Transient Heat Transfer Experiment ME 331 Introduction to Heat Transfer June 1st 2017 . This heat transfer coefficient is related to the predicted convection heat transfer rate increased effect of radiation heat loss. Since the lumped capacitance model is

Get Price### Transient Heat Transfer and Energy Balance Model for

Jun 05 2016 · This investigation details the development of a simple transient model to predict the bulk toroidal flow fluid temperature of the automotive torque converter based upon an energy balance and the derivation of an overall convective heat transfer correlation for the entire turbomachine. Data collected on a torque converter specific dynamometer setup is used to derive a Nusselt correlation for

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Feb 25 2019 · The transient temperature field in the walls of the channels was modeled using control volume based finite element method (CVFEM) and the heat transfer in the flowing air was modeled by finite volume method (FVM).

Get Price### A Method for Determining the Heat Transfer Properties of

Oct 22 2008 · Three parameters must be known to calculate the heat transfer performance of a foam-fin the product h m A c as a function of flow-rate (the convective conductance per unit volume) the product k s A k (the effective conductive conductance as a fin) and R bond (the effective thermal resistance between the foam and the surface to which it

Get Price### MODELING OF HEAT TRANSFER AND ABLATION OF

a conjugate heat transfer model where the maximum temperature is intentionally capped at the melting temperature of the refractory material. The melting temperature is approximately 1373 K. The mapping of the heat flux data shows good qualitative comparison between the CFD result and the Thermal Desktop result as shown in Figure 16.

Get Price### Fully coupled transient modeling of ceramic foam

Mar 01 2013 · The pressure drop of the absorber the interfacial heat transfer between the flowing fluid and solid and the radiative heat transfer due to concentrated solar radiation absorption by ceramic foam and the radiation transport inside the media were included together in this transient model.

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heat transfer shock capturing Turbulence Heat transfer Finite volume options Equations. based on the central-upwind schemes of Kurganov and Tadmor Input requirements. Mandatory fields p pressure Pa U velocity m/s T temperature K Physical models. turbulence constant/turbulenceProperties heat transfer constant/thermophysicalModels

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Modeling of Transient Heat Transfer in Foamed Concrete Slab 327 Journal of Engineering Science and Technology June 2013 Vol. 8(3) Nomenclatures c Specific heat of material J/kg°C cp Overall specific heat capacity J/kg°C cpi Component specific heat J/kg°C d Specimen thickness mm e Effective emissivity ew Dehydration water content Fi Weight fraction of each component

Get Price### Transient Heat ConductionSimon Fraser University

Transient Heat Conduction In general temperature of a body varies with time as well as position. Lumped System Analysis Interior temperatures of some bodies remain essentially uniform at all times during a heat transfer process. The temperature of such bodies are only a function of time T = T(t). The

Get Price### (PDF) Optimization of a Functionally Graded Metallic Foam

The model used to calculate the heat transfer coefficient in the foam is discussed by Venkataraman et al. (2002). At high temperatures radiation dominates the heat transfer and at low temperatures conduction dominates the heat transfer. To minimize radiation we require higher solidity foams (smaller foam pore sizes) while to minimize

Get Price### (PDF) Optimization of a Functionally Graded Metallic Foam

The model used to calculate the heat transfer coefficient in the foam is discussed by Venkataraman et al. (2002). At high temperatures radiation dominates the heat transfer and at low temperatures conduction dominates the heat transfer. To minimize radiation we require higher solidity foams (smaller foam pore sizes) while to minimize

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Oct 14 2004 · The problem of minimizing the maximum temperature of a structure insulated by a functionally graded metal foam insulation under transient heat conduction is studied. First the performance of insulation designed for steady-state conditions is compared with uniform solidity insulation. It is found that the optimum steady-state insulation performs poorly under transient

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A New Method for Numerical Modeling of Heat Transfer in Thermal Insulations Products 83 where kTc is the effective thermal conductivity of the medium. The semi-empirical relation suggested by Langlais and Klarsfeld (2004) was used to model kTc() for insulations made of silica fibers.

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Induced Heat Transfer in Metal Foam . Tizian Bucher1 Laser Forming Metal Foam Geometrical Modeling Heat Transfer Numerical Simulation. infrared camera to measure the transient response of Al-foam during laser pulses and laser scans. 2. BACKGROUND . 2.1 Heat Transfer in Metal Foams .

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A W-P model composed of six tetrakaidecahedrons and two irregular dodecahedrons was used to simulate the melting heat transfer process in open foam

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Calculations of heat transfer through porous foams filled with phase-change materials are often performed using either an effective medium approach or a coupled two-temperature model. These models are generally applied to simulate heating processes that occur over a few hours thus allowing for an assumption of effective melting front in which both liquid and solid phases are present or clear

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A transient heat transfer analysis was conducted adopting the time step according to recommendations given in 2 . To avoid the appearance of space oscillations of the solution in the case of

Get Price### Heat-Transfer and Solidification Model of Continuous Slab

Aug 27 2002 · The model includes heat mass momentum and force balances on the slag layers in the interfacial gap. This model is part of a larger comprehensive system of models of fluid flow heat transfer and mechanical behavior which is being developed and applied to study the formation of defects in the continuous casting process. These other models

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Modeling transient heat transfer between two 1-D materials. Ask Question Asked 5 years 5 months ago. Active 3 years 11 months ago. Viewed 429 times 1 begingroup So I have been working on creating a 1-D model of a material with a layer of heat resistant material stuck to it. For this I have been trying to use the implicit finite

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Effect of Geometrical Modeling on the Prediction of Laser-Induced Heat Transfer in Metal Foam Over the past several decades aluminum foam (Al-foam) has found increasing popularity in industrial applications due to its unique material properties. Unfortunately till date

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across the aluminum foam are measured by pressure taps while interstitial heat transfer coefﬁcients in the aluminum foam are determined using a transient single-blow technique with a thermal

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