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An inverse problem method for overall heat transfer coefficient estimation in a partially filled rotating cylinder
, Article Heat Transfer Engineering ; Volume 29, Issue 3 , 2008 , Pages 272-283 ; 01457632 (ISSN) ; Heydari, M. M ; Sharif University of Technology
2008
Abstract
The objective of this article is to study the estimation of an overall heat transfer coefficient in a partially filled rotating cylinder. Herein is an inverse analysis for estimating the overall heat transfer coefficient in an arbitrary cross-section of the aforementioned system from the temperatures measured on the shell. The material employs the finite-volume method to solve the direct problem. The hybrid effective algorithm applied here contains the local optimization algorithm to estimate the unknown parameter by minimizing the objective function. The data measured here are simulated by adding random errors to the exact solution. An investigation is made of the impact of the measurement...
Three-dimensional elasticity analysis of functionally graded rotating cylinders with variable thickness profile
, Article Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ; Volume 226, Issue 3 , 2012 , Pages 585-594 ; 09544062 (ISSN) ; Asghari, M ; Sharif University of Technology
Abstract
A three-dimensional elasticity solution for the analysis of functionally graded rotating cylinders with variable thickness profile is proposed. The axisymmetric structure has been divided in several divisions in the radial direction. Constant mechanical properties and thickness profile are assumed within each division. The solution is considered for four different thickness profiles, namely constant, linear, concave, and convex. It is shown that the linear, concave, and convex thickness profiles have smaller stress values compared to a constant thickness profile. The effects of various grading indices as well as different boundary conditions, namely solid, free-free hollow and fixed-free...
Analytical prediction of the temperature field in laser assisted machining
, Article Procedia CIRP, 31 May 2016 through 2 June 2016 ; Volume 46 , 2016 , Pages 575-578 ; 22128271 (ISSN) ; Movahhedy, M. R ; Ahmadian, M. T ; Razavi, R. S ; Sharif University of Technology
Elsevier
2016
Abstract
Laser assisted machining (LAM) is a promising technology for machining hard to cut materials. In most experimental cases, LAM is undergone in two stages; first, the temperature at the material removal point (Tmr) is tuned by adjusting laser parameters and next, the cutting tool is engaged. Introduction of highly localized heat energy to the workpiece makes the modeling of this process very complicated. Hence, an analytical model for the first stage of the process - rather than multiple experiments or FE modelling - would be beneficial. This article presents an analytical solution to the transient, temperature field in a rotating cylinder subject to a localized laser heat source. The...
Optimization of the heat transfer coefficient and pressure drop of Taylor-Couette-Poiseuille flows between an inner rotating cylinder and an outer grooved stationary cylinder
, Article International Journal of Heat and Mass Transfer ; Volume 108 , 2017 , Pages 1449-1459 ; 00179310 (ISSN) ; Nakhchi, M. E ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
The aim of this study is to find optimum values of design parameters of annular flow with outer grooved cylinder and rotating inner cylinder in the presence of axial flow by using Response surface Method (RSM). This configuration is popular in cooling of electric generators and rotating machineries. Groove aspect ratio (0
Prediction of local shear stress and heat transfer between internal rotating cylinder and longitudinal cavities on stationary cylinder with various shapes
, Article International Journal of Thermal Sciences ; Volume 138 , 2019 , Pages 512-520 ; 12900729 (ISSN) ; Nakhchi, M. E ; Sharif University of Technology
Elsevier Masson SAS
2019
Abstract
A numerical analysis has been performed to simulate flow structure, heat transfer, and pressure drop of turbulent flow in an annulus with a few longitudinal cavities on the outer stationary cylinder. The cross sections of cavities are rectangular, closed and open trapezoidal shapes. This kind of annular flow is applicable to industries applications such as electrical generators where heat generates in the cavities containing wires, heating of axial compressor rotor drams, rotating heat pipes for cooling of superconducting machines or motor rotor. The governing equations of turbulent flow are solved by using Renormalization group (RNG) k–ε model for Reynolds and Taylor numbers in the range of...