Numerical study of transient conjugate heat transfer of the cryo-supersonic air-quenching based on a Mach-weighted pressure-based method

Yang, Jian; Zhang, Yue; Gao, Ming-Xin; Fu, Lihua; Shu, Hua

doi:10.1016/j.ijheatmasstransfer.2019.01.064

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…The core idea is to consider the flow field as steady-state while treat the temperature fields of the fluid domain and solid domain as transient. The general two-dimensional axisymmetric governing equations for steady-state flow of the forced air quenching in the orthogonal curvilinear coordinates ( ξ , η ) can be written as [ 25 ] where where U , V and ϕ (1, u , v , k , ε , T ) are the contravariant velocity components and the general variable, respectively. b ϕ and c ϕ are the pressure coefficients.…”

Section: Physical and Numerical Modelmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%

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Heat transfer analysis of the forced air quenching with non-isothermal and non-uniform oxidation

et al. 2021

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In this paper, the heat transfer characteristics of the forced air quenching with non-isothermal and non-uniform oxidation are investigated. By introducing the variations of interfacial temperature and oxygen partial pressure, a three-layered non-isothermal high-temperature oxidation kinetic model is developed, in which a discrete-time modeling method is employed to solve the problem of integration of the transient terms, and a special interfacial grid treatment is used for considering the growth of each oxide layer and updating of the thermal properties. Moreover, a parameter identification method using the multi-objective genetic algorithm is proposed for the inverse solution of the oxidation parabolic parameters based on the measured scale thicknesses in oxidation experiment. A case study of the forced air quenching of a Q235 disk is presented to validate the availability of the developed formulas. Then the interfacial heat transfer characteristics are analyzed, while the numerical solutions with and without oxidation are both performed for in-depth comparison. Results indicate that the active quenching region is mainly centralized in the vicinity of stagnation region. The radial variation regularity of the temperature difference across the total oxide layer is mainly determined by the thermal conductivity and the scale thickness. The existence of the oxide scale actually produces a certain thermal resistance during the quenching process and the effects of the oxide scale increases with the radial coordinate due to the interfacial temperature distribution. The results obtained can provide theoretical derivation for precise control of the internal phase transformation during the forced air quenching process.

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Section: Physical and Numerical Modelmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%

Heat transfer analysis of the forced air quenching with non-isothermal and non-uniform oxidation

et al. 2021

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“…(5) recording the surface temperatures by the infrared thermometers; (6) terminating the experiment when it is on the pre-set time and simultaneously putting the metal disk into the vacuum bucket; (7) vacuuming the bucket and filling it with argon at a certain negative pressure; (8) taking out the cooled disk to prepare the metallographic specimens at different radial positions; (9) measuring the oxide film thickness by the optical microscope.…”

Section: Model Verificationmentioning

confidence: 99%

“…During the cooling process of the cryo-supersonic air-quenching, the non-isothermal growth of the oxide film with varying interfacial temperature and oxygen partial pressure would lead to more complex transient conjugate heat transfer. Thus, based on our earlier work with constant film thickness [7], the specific heat transfer phenomenon induced by the oxidation kinetics needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

Effects of non-isothermal oxidation on transient conjugate heat transfer of the cryo-supersonic air-quenching

et al. 2022

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In this paper, the effects of non-isothermal oxidation on transient conjugate heat transfer of the cryo-supersonic air-quenching are investigated based on a double-layered oxidation kinetics model, while a unified conjugate heat transfer formula is developed to synthetically consider the near-wall turbulence, non-isothermal oxidation, and surface radiation. The comparison between numerical and experimental results are also presented to check the validity of the developed model. The results indicate that the film growth has some degree of inhibition to the conjugate heat transfer, in particular, the stagnation temperature increases linearly by about 5 K per 100 ?m increase in film thickness, and the effective conjugate heat transfer coefficient in the stagnation region decreases linearly by about 55 Wm-2K-1 per 100 ?m increase in film thickness. Moreover, the oxide film would have little impact on transient conjugate heat transfer when the near-wall velocity is higher due to the effect of viscous dissipation.

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“…The numerical simulation method is widely used because of its cost-effectiveness and high stability [ 11 – 15 ]. However, it is difficult to obtain a mathematical model of supersonic air-quenching considering the efficiency and accuracy of numerical simulations [ 6 , 16 ]. On the one hand, a large pressure gradient, large temperature gradient, and large velocity gradient exist simultaneously [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the transient heat transfer to a supersonic air jet impinging on a high-temperature plate based on a discrimination-experiment method

et al. 2022

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A discrimination-experiment method is developed to investigate the transient heat transfer of air jet impingement by discretizing the solid domain into mutually adiabatic test cylinders. This method can not only reduce the influence of the transverse heat transfer of a solid domain on the heat transfer characteristics of the jet but can also simplify the two-dimensional or three-dimensional heat conduction problem into a one-dimensional problem. Moreover, the discrimination-experiment method eliminates the embedment of thermocouples into the solid domains, further improving the accuracy and reliability of the proposed method. The transient heat transfer characteristics of a supersonic air jet impinging on a high-temperature target (860°C) and the effects of thermo physical parameters, such as the density, specific heat capacity, thermal conductivity and nozzle-to-target distance (H/D = 3, 4, and 5) are analyzed in detail using the discrimination-experiment method. The results provide important guidance for the thermal design of supersonic air jet impingement.

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Numerical study of transient conjugate heat transfer of the cryo-supersonic air-quenching based on a Mach-weighted pressure-based method

Cited by 6 publications

References 32 publications

Heat transfer analysis of the forced air quenching with non-isothermal and non-uniform oxidation

Heat transfer analysis of the forced air quenching with non-isothermal and non-uniform oxidation

Effects of non-isothermal oxidation on transient conjugate heat transfer of the cryo-supersonic air-quenching

Investigation of the transient heat transfer to a supersonic air jet impinging on a high-temperature plate based on a discrimination-experiment method

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