Three-Dimensional Simulation of Heat and Mass Transfer Processes during SHF Heating of Oil Flow in a Pipeline

Arutyunyan, R. V.

doi:10.1007/s10891-021-02352-3

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Such asymmetric thermal excitation can be seen in the fluid flow within pipes subjected to thermal asymmetrical boundary conditions which take place in many real industrial situations such as those related to solar thermal devices, aerial pipelines subjected to external temperatures, etc. Other examples and attempts to solve this problem can be seen on: [23][24][25][26]. Firstly, a graded model is introduced to indicate that how the material properties vary with respect to the thickness direction.…”

Section: ( Log )mentioning

confidence: 99%

A Mixed Pseudo-spectral FFT-FE Method for Asymmetric Nonlinear Heat Transfer of a Functionally Graded Hollow Cylinder

2023

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In this article, a novel spectral method based on the integral transform and finite element (FE) method is introduced for nonlinear thermal analysis of a hollow cylinder under asymmetric boundary excitations. The material properties are temperature-dependent and vary in terms of spatial coordinates. This dependency makes the problem to be nonlinear. The intended nonlinear heat conduction equation is discretized using finite elements in the radial direction. Fast Fourier transform (FFT) technique with the uniform distribution of the harmonics in the circumferential direction, is used to discretize the periodic domain and boundary conditions. The use of the FFT algorithm is accompanied by a significant save in computational times and efforts. In such problems, the Pseudo-spectral technique, as an evolved model of the spectral method, is utilized whenever the material properties vary in terms of the periodic variables or there exists a nonlinear term. The convolution sum technique is appropriately used to transform the nonlinear terms in the Fourier space. Thermal boundary conditions at the inner surface of the cylinder are considered in asymmetrical form. In compliance with the other analytical and numerical solutions, the present mixed-method benefits from the fast rate of convergence and high accuracy.

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Section: ( Log )mentioning

confidence: 99%

A Mixed Pseudo-spectral FFT-FE Method for Asymmetric Nonlinear Heat Transfer of a Functionally Graded Hollow Cylinder

2023

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“…This chapter faces the problem of fluid flow within pipes subjected to thermal asymmetrical boundary conditions which take place in many real industrial situations such as those related to solar thermal devices, aerial pipelines subjected to external temperatures, etc. Other examples and attempts to solve this problem can be seen on: [27][28][29][30][31]. Despite the asymmetry of the problem, much simpler bi-dimensional models are currently used for pipe design purposes, ignoring the important consequences of the asymmetry that it exists.…”

Section: Introductionmentioning

confidence: 99%

Alarcón¹,

Seco-Nicolás²,

Luna-Abad³

et al. 2023

Pipeline Engineering - Design, Failure, and Management

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This chapter studies the fluid flow within pipes subjected to thermal asymmetrical boundary conditions. The phenomenon at hand takes place in many real-world industrial situations, such as solar thermal devices, aerial pipelines. A steady-state analysis of laminar forced-convection heat transfer for an incompressible Newtonian fluid is studied. The fluid is considered to flow through a straight round pipe provided with straight fins. For the case studied, axial heat conduction in the fluid has been considered and the effects of the forced convection have been considered to be dominant. A known uniform temperature field is applied at the upper external surface of the assembly. The 3D assembly has been created combining cylindrical and Cartesian coordinates. The governing differential equation system is solved numerically through suitable discretization in a set of different finite volume elements. The results are shown through the thermal profiles in respect of longitudinal and radial-azimuthal coordinates and the problem characteristic length. To facilitate the resolution of this phenomenon, an open computing platform called HEATT©, based on this model, has been developed, and it is also shown here. The platform is now being built and is expected to be freely available at the end of year 2022.

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Environmentally Safe Microwave Heating of Non-Polar Materials

Saranchin

2022

jjeci

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The current research presents results for the theoretical basis of heat transfer and experimental studies of a microwave method of heating uranium hexafluoride for safe evaporation from containers, including defective, and low- and medium-temperature heating of oil fractions. The process is environmentally safe because heat generation occurs in the bulk of the heated medium and is easily controlled. The proposed method is based on uranium hexafluoride evaporation at the expense of heat energy transferred from substances absorbing microwave energy. The conducted investigation on a laboratory bench with a direct heating regime of samples by microwave field of a travelling wave of lowest mode H10 and in the process studied, samples were heated both individually and in combination with UF6. The results show that it was determined that uranium oxides are the most preferable for use as heat absorbing agents for the microwave heating process. A demonstration on a pilot scale was designed for testing the feasibility of this process. The dielectric characteristics of two components mixing were studied. The penetration depth of microwave into the mixture and heat-absorbing agent amount for process implementation has been determined. Several experimental tests on the environmentally safe technology at pilot scale installation were conducted at various continuous modes. The results revealed from the pilot unit showed that the microwave method of evacuation of DUF6 from steel containers allows them to be emptied safely with practically cold (T<1000C) walls, with high efficiency of using microwave energy (η≈97%) while maintaining the level of pressure in the containers.

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Three-Dimensional Simulation of Heat and Mass Transfer Processes during SHF Heating of Oil Flow in a Pipeline

Cited by 3 publications

References 5 publications

A Mixed Pseudo-spectral FFT-FE Method for Asymmetric Nonlinear Heat Transfer of a Functionally Graded Hollow Cylinder

A Mixed Pseudo-spectral FFT-FE Method for Asymmetric Nonlinear Heat Transfer of a Functionally Graded Hollow Cylinder

Forced Laminar Flow in Pipes Subjected to Asymmetric External Conditions: The HEATT© Platform for Online Simulations

Environmentally Safe Microwave Heating of Non-Polar Materials

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