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Fluid Flow and Mixed Heat Transfer in a Horizontal Channel with an open cavity and Wavy Wall

Intelligent Automation & Soft Computing 2023年第7期37卷 147-163页

作者： Tohid Adibi Shams Forruque Ahmed Omid Adibi Hassan Athari Irfan Anjum Badruddin Syed Javed Department of Mechanical Engineering University of BonabBonabIran Science and Math Program Asian University for WomenChattogramBangladesh Energy Management Group Energy and Environment Research CenterNiroo Research InstituteTehranIran Department of Mechanical Engineering Elm-o-Fann University College of Science and TechnologyUrmiaIran Mechanical Engineering Department College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia

Heat exchangers are utilized extensively in different industries and ***,optimizing heat exchangers has been a major concern among *** various studies have been conducted to improve the heat transfer rate,the use of a wavy wall in the presence of different types of heat transfer mechanisms has not been *** study thus investigates the mixed heat transmission behavior of fluid in a horizontal channel with a cavity and a hot,wavy *** fluid flow in the channel is considered laminar,and the governing equations including continuity,momentum,and energy are all solved *** numerical solution is stabilized by using a first-order multi-dimensional characteristic-based scheme in combination with a fifth-order Runge-Kutta *** flow and heat transfer effects of varying Richardson numbers,Reynolds numbers,wave amplitude,wavelength,channel height,and cavity width are *** results indicate that the mean Nusselt number increases with an increase in Reynolds number,wave amplitude,and cavity width,while it decreases with an increase in Richardson number,wavelength,and channel *** minimum Nusselt number is calculated to be 0.7,whereas the maximum Nusselt number is *** Nusselt number has only increased by 40%in the higher depths of the cavity,despite the Richardson number being 10,000 times *** this figure increases to 130%at lower *** mean Nusselt number is thus significantly influenced by channel height and cavity *** influence of wave amplitude on the mean Nusselt number is twice that of wavelength.

关键词： Mixed heat transfer wavy wall horizontal channel open cavity numerical simulation

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Prediction of Hydrodynamic Noise of open cavity Flow

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Transactions of Tianjin University 2009年第5期15卷 336-342页

作者：耿冬寒王玉 School of Mechanical Engineering Tianjin University

In this paper,the hydrodynamically generated noise by the flow over an open cavity is ***,aeroacoustic theories and computational aeroacoustic(CAA) methodologies are reviewed in light of hydrodynamic acoustics,based on which,a hybrid method is *** the coupling procedure,the unsteady cavity flow field is computed using large-eddy simulation(LES) ,while the radiated sound is calculated by the Ffowcs Williams-Hawkings(FW-H) acoustic analogy with acoustic source terms extracted from the time-dependent solutions of the unsteady *** hybrid LES-FW-H acoustic analogy method is tested with an open cavity flow at Mach number of 0.006 and Reynolds number of 105 .Following the reflection theorem of Powell,the contributions from different source terms are quantified,and the terms involving wall-pressure fluctuations are found to account for most of the radiated *** radiation field is investigated in the frequency *** the longitudinal direction,the sound propagates with a dominant radiation downstream the cavity in the near-field and a flatter directivity in the far-field,while for the spanwise direction,the acoustic waves have a similar propagation along+z and-z directions,with no visible directivity.

关键词： hydrodynamic acoustic open cavity large-eddy simulation acoustic analogy

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Effects of Rayleigh Number on MHD Heat Transfer and Fluid Flow in Two-Dimensional open Square cavity with Heat Generation

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American Journal of Computational Mathematics 2016年第1期6卷 1-16页

作者： Sheikh Anwar Hossain Mohammad Abdul Alim Satrajit Kumar Saha Narail Government Victoria College Narail Bangladesh Department of Mathematics Bangladesh University of Engineering & Technology Dhaka Bangladesh Department of Mathematics Jahangirnagar University Dhaka Bangladesh

The present work is devoted to investigating heat transfer and fluid flow in a two dimensional square open cavity containing a heated circular cylinder at the centre. A constant heat flux is set at the left sidewall;high and low temperatures are fixed at the bottom and top walls of the cavity respectively. The right side of the cavity is open. Galerkin Weighted Residual Finite Element Analysis is used to visualize the heat transfer and fluid flow solving two-dimensional governing mass, momentum and energy equations for steady state, heat transfer and fluid flow in presence of magnetic field in side an open square cavity. A uniformly heated circular cylinder is placed at the centre of the cavity as a heat source. To find the effects of Rayleigh number (Ra) on the thermal fields and fluid flow in presence of magnetic field and a heated circular cylinder as heat source by visualization and line graphs is the objective of this study. Numerical results are presented in graphical and tabular form. The study is conducted for different values of Rayleigh number, some fixed Hartmann numbers (Ha) and heat flux (q). In the conclusion it has been observed that the temperature field and fluid flow pattern are functions of the parameters Rayleigh number and Hartmann number.

关键词： Natural Convection Rayleigh Number Hartmann Number MHD Heated Cylinder open cavity Heat Flux

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Flow induced structural vibration and sound radiation of a hydrofoil with a cavity

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Journal of Hydrodynamics 2018年第6期30卷 1022-1037页

作者： Jin Tian Guo-qing Yuan Hong-xing Hua Institute of Vibration Shock and Noise Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University

The structural vibration and the sound radiation induced by the flow over a cavity on a hydrofoil are investigated experimentally and numerically. The large eddy simulation(LES) is adopted to calculate the flow field and the pressure fluctuation characteristics. A coupled finite element method/boundary element method approach is used to analyze the hydrofoil vibration and the structure-borne noise. The flow noise is calculated using an acoustic analogy by considering the surface pressure fluctuations as the dipole sources. A hollow hydrofoil with an orifice supported by four cylinder rods is constructed for the experiments. Modal tests are performed to obtain the natural frequencies of the hydrofoil in air and water. The vibro-acoustic experiments are carried out in the water tunnel at various free stream velocities with the orifice open and closed. A pressure transducer is used to measure the pressure fluctuations behind the downstream edge of the orifice. The triaxial accelerometers mounted on the side walls are used to measure the vibrational response of the hydrofoil. Furthermore, a hydrophone located in a box, filled with water is used to measure the sound radiation. The structure-borne noise and the flow noise are identified by their frequency properties. Reasonable agreements are observed between the numerical predictions and the experimental measurements.

关键词： Vibration structure-borne noise flow noise hydrofoil open cavity large eddy simulation(LES)

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A hybrid method for inverse cavity scattering problem for shape

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Applied Mathematics(A Journal of Chinese Universities) 2010年第2期25卷 127-136页

作者： LIU Juan MA Fu-ming School of Mathematics, Jilin University, Changchun 130012, China. School of Mathematics Jilin University Changchun China

In this paper, we give a hybrid method to numerically solve the inverse open cavity scattering problem for cavity shape, given the scattered solution on the opening of the cavity. This method is a hybrid between an iterative method and an integral equations method for solving the Cauchy problem. The idea of this hybrid method is simple, the operation is easy, and the computation cost is small. Numerical experiments show the feasibility of this method, even for cases with noise.

关键词： open cavity Cauchy problem Helmholtz equation integral equations system method iterativehybrid method.

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Memory effects in scattering from accelerating bodies

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Advanced Photonics 2020年第5期2卷 64-73页

作者： Vitali Kozlov Sergei Kosulnikov Dmytro Vovchuk Pavel Ginzburg Tel Aviv University School of Electrical EngineeringTel AvivIsrael Yuriy Fedkovych Chernivtsi National University Department of Radio Engineering and Information SecurityChernivtsiUkraine

Interaction of electromagnetic,acoustic,and even gravitational waves with accelerating bodies forms a class of nonstationary time-variant *** waves contain intrinsic signatures of motion,which manifest in a broad range of phenomena,including Sagnac interference,and both Doppler and micro-Doppler frequency *** general relativity is often required to account for motion,instantaneous rest frame approaches are frequently used to describe interactions with slowly accelerating *** investigate theoretically and experimentally an interaction regime that is neither relativistic nor *** test model considers an accelerating scatterer with a long-lasting relaxation *** slow decay rates violate the instantaneous reaction assumption of quasistationarity,introducing nonMarkovian contributions to the scattering *** signatures in scattering from a rotating dipole are studied theoretically,showing symmetry breaking of micro-Doppler combs.A quasistationary numeric analysis of scattering in the short-memory limit is proposed and validated experimentally with an example of electromagnetic pulses interacting with a rotating wire.

关键词： light-matter interaction electromagnetic scattering quality factor open cavity

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