Numerical analysis on thermal characteristics of transpiration cooling with coolant phase change

Xin, Chengyun; Lu, Lixin; Liu, Xinyu

doi:10.1007/s10973-017-6562-3

Cited by 14 publications

(2 citation statements)

References 32 publications

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“…Dong and Wang [20,21] established a SMM and considered modifications to the diffusion coefficient in the fluid energy equation to study the heat transfer deterioration effects caused by local high heat flux. Xin et al [22] used a SMM to explore the influence of thermal conductivity and porosity of porous media materials on transpiration cooling effects. He et al [23] employed a transient SMM to investigate the impact of different injection modes and periodic operations.…”

Section: Introductionmentioning

confidence: 99%

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection

Jin,

Zhao,

Yao

et al. 2024

Adv. Aerodyn.

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Aiming to efficiently simulate the transient process of transpiration cooling with phase change and reveal the convection mechanism between fluid and porous media particles in a continuum scale, a new two-phase mixture model is developed by incorporating the local thermal non-equilibrium effect. Considering the low-pressure and high overload working conditions of hypersonic flying, the heat and mass transfer induced by capillary and inertial body forces are analyzed for sub-cooled, saturated and super-heated states of water coolant under varying saturation pressures. After the validation of the model, transient simulations for different external factors, including spatially-varied heat flux, coolant mass flux, time-dependent external pressure and aircraft acceleration are conducted. The results show that the vapor blockage patterns at the outlet are highly dependent on the injection mass flux value and the external pressure, and the reduced saturation temperature at low external pressure leads to early boiling off and vapor blockage. The motion of flying has a large influence on the cooling effect, as the inertial force could change the flow pattern of the fluid inside significantly. The comparison of the results from 2-D and 3-D simulations suggests that 3-D simulation shall be conducted for practical application of transpiration cooling, as the thermal protection efficiency may be overestimated by the 2-D results due to the assumption of an infinite width length of the porous plate.

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Section: Introductionmentioning

confidence: 99%

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection

Jin,

Zhao,

Yao

et al. 2024

Adv. Aerodyn.

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“…LTNE model however requires solving separate energy equations for the two phases in the porous regions, which are coupled through an internal heat exchange term. Hence, the LTNE model leads to more accurate prediction of the temperature fields in porous media (e.g., [8,20,[36][37][38]). Guo et al [39] studied numerically heat transfer of pulsating flow based on LTE model in a tube partially filled with a porous medium attached to the pipe walls.…”

Section: Introductionmentioning

confidence: 99%

Pulsating flow in a channel filled with a porous medium under local thermal non-equilibrium condition: an exact solution

Nazari

Mahmoudi

2020

J Therm Anal Calorim

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The present work investigates analytically the problem of forced convection heat transfer of a pulsating flow, in a channel filled with a porous medium under local thermal non-equilibrium condition. Internal heat generation is considered in the porous medium, and the channel walls are subjected to constant heat flux boundary condition. Exact solutions are obtained for velocity, Nusselt number and temperature distributions of the fluid and solid phases in the porous medium. The influence of pertinent parameters, including Biot number, Darcy number, fluid-to-solid effective thermal conductivity ratio and Prandtl number are discussed. The applied pressure gradient is considered in a sinusoidal waveform. The effect of dimensionless frequency and coefficient of the pressure amplitude on the system's velocity and temperature fields are discussed. The general shape of the unsteady velocity for different times is found to be very similar to the steady data. Results show that the amplitudes of the unsteady temperatures for the fluid and solid phases decrease with the increase in Biot number or thermal conductivity ratio. For large Biot numbers, dimensionless temperatures of the solid and fluid phases are similar and are close to their steady counterparts. Results for the Nusselt number indicate that increasing Biot number or thermal conductivity ratio decreases the amplitude of Nusselt number. Increase in the internal heat generation in the solid phase does not have a significant influence on the ratio of amplitude-to-mean value of the Nusselt number, while internal heat generation in the fluid phase enhances this ratio. Keywords Porous media • Pulsating flow • Convective heat transfer • Local thermal non-equilibrium • Analytical solution List of symbols a n , a j Time-dependent coefficient a sf Interfacial area per unit volume of porous media (m −1) A A defined function of time A 1 ,A 2 Constant coefficients b m,n Time-dependent coefficient B A defined function of time B 1 ,B 2 Constant coefficients Bi Biot number, Bi = a sf h sf H 2 k s,eff c pf Fluid specific heat (J kg −1 K −1) c ps Solid specific heat (J kg −1 K −1) C Constant parameter, C =

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Thermal barrier coated surface modifications for gas turbine film cooling: a review

Anand

Parammasivam

2020

J Therm Anal Calorim

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Numerical analysis on thermal characteristics of transpiration cooling with coolant phase change

Cited by 14 publications

References 32 publications

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection

Pulsating flow in a channel filled with a porous medium under local thermal non-equilibrium condition: an exact solution

Thermal barrier coated surface modifications for gas turbine film cooling: a review

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