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Hydrodynamics and Heat Transfer Analysis of Airflow in a Sinusoidally Curved Channel

Computers, Materials & Continua 2022年第6期71卷 4835-4853页

作者： Abid.A.Memon M.Asif Memon Kaleemullah Bhatti Thanin Sitthiwirattham nichaphat patanarapeelert Department of Mathematics and Social Sciences Sukkur IBA UniversitySukkur65200SindhPakistan Mathematics Department Faculty of Science and TechnologySuan Dusit UniversityBangkok10300Thailand Department of Mathematics Faculty of Applied ScienceKing Mongkut’s University of Technology North BangkokBangkok10800Thailand

For heat transfer enhancement in heat exchangers,different types of channels are often *** performance of heat exchangers can be made better by considering geometry composed of sinusoidally curved *** research studies the modeling and simulation of airflow through a 2πunits long sinusoidally curved wavy *** the purpose,two-dimensional Navier Stokes equations along with heat equations are under *** simulate the fluid flow problem,the finite element-based software COMSOL Multiphysics 5.4 is *** parametric study for Reynolds number from Re=100 to Re=1000 and the period of vibration P from 0 to 5 are *** surface plots,streamline patterns,contours,and graphs are presented for the velocity field magnitude,temperature,and pressure against the Reynolds number as well as period of *** results are compared with various *** is found that due to the creation of periodic contraction regions the velocity magnitude of the flow is continuously increasing with the increase of Reynolds number,on the contrary the pressure is decreasing from inlet to outlet of the ***,a periodic variation in the pressure distribution along the vibrating boundaries has been found with an average increase of 500%for the high Reynolds number.A novel work was done by expressing the rotation rate per second in terms of local Reynolds number for the recirculating regions found due to the periodic oscillation of the *** average temperature near the outlet where a fixed temperature is imposed initially is decreasing with an increase in Reynolds *** convection process is weakened due to an increase of periodic vibration of boundaries.

关键词： Simulation of fluid flow heat transfer cosine function wavy channel

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Forecasting Number of Students in University Department: Modeling Approach

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Open Journal of Applied Sciences 2013年第4期3卷 293-297页

作者： nichaphat patanarapeelert Klot patanarapeelert Department of Mathematics Faculty of Applied Sciences King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Mathematics Faculty of Science Silpakorn University Bangkok Thailand

In this study, the mathematical models of dynamics of student populations in the university departments are formulated. As a case study, we employ the data of registration section from Department of Mathematics, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok (KMUTNB), Thailand, from calendar year 2006 to 2010. Using regression analysis, descriptive model and explanatory model are derived. The descriptive model is linear with R2 = 0.8864. Using log-transformation, the explanatory model gives the nonlinear approximation with R2 = 0.8293. The model predicts that the number of students of Department of Mathematics, KMUTNB has a tendency to linearly increase with slope of 20 with 95% CI (6.8417, 33.1583). The application of the models in educational management is discussed.

关键词： Student Population Regression Analysis Descriptive Model Explanatory Model

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