Vol 9 Issue 1 April 2021-September 2021

Abstract: The two-dimensional flow characteristics in the lid- driven square cavity are simulated using the computational Fluid Dynamic (CFD). The governing equations are Navier-Stokes Equations, they are discretized with Finite Volume Method (FVM) and the software Fluent is used to calculate. A stretched quadrilateral mesh with 75000 cells was used. Various Reynolds numbers (100, 500,1000 and 2000) and aspect ratio H/L (0.5, 1, 2 and 4) in the flow characteristics is studied. Then the calculating results are compared with the numerical results in literature and the results obtained shows a good agreement. After that, the shape of vortex was investigated and the instability of the flow field was analyzed by the energy gradient theory. It has been found that the magnitude of K is proportional to the Reynolds number, the higher Reynolds number is, the bigger the K value becomes which means that the fluid become more unstable. The Kmax is located at the corner region between the circulation vortices and the static walls of the square. According to energy theory the  Kmax  position will lose the stability earlier than the other position. The Kmax  position change and tends to settle to the left wall of square when the Reynolds number increase. The shape of the vortex is controlled by the aspect ratio as well as the Reynolds numbers.

Keywords: Numerical simulation, laminar flow, lid driven cavity, energy gradient theory.

Title: Numerical analysis of span-wise aspect ratio effect on the 2D flow stability in Lid-driven cavity using the energy gradient theory

Author: Mapanga Mbemba Cloud Messie Rodelay, Hua-Shu Dou

International Journal of Mechanical and Industrial Technology      

ISSN 2348-7593 (Online)

Research Publish Journals

Abstract: Today’s fast moving world and the world of technology saving time and human efforts is need of time. So in modern farming, use of power rotor, sugarcane cutter and wheat cutter has been increased. The use of groundnut harvester is also quite beneficial in saving human efforts and time and making farming a bit easy task.                  

Hence, designing, manufacturing and testing a groundnut harvester for marginal farms is our main objective. For designing such a harvester we have referred current groundnut harvester which is available in market and improved its design using solid works software. According to area the type and the content of soil, the stress which is exerted on the harvester is also different. Hence, for testing we have used ansys  software.

Keywords: ground nut harvester, harvester cutter, solid works, ansys.                

Title: Design and Analysis of Blade in Groundnut Harvesting Machine

Author: Ashish chougale, Prashant Mane, Prashant Borkute, Suraj Thorat, Rushikesh Sawant^,, Sachin Chandapure, Prashant Pandav

International Journal of Mechanical and Industrial Technology      

ISSN 2348-7593 (Online)

Research Publish Journals

Abstract: The main aim of this research is to investigate the impact with a point of skew on the blade of the axial fan by calculating mass flow, rotor velocity, and pressure acting on the fluid by the fan's blade to obtain optimal efficiency. It has been observed that fluctuations in mass flow due to higher rotational speed (rpm) lead to an uneven distribution of the outlet speed of the flow line located in the ventilation hole of the stator, leading to a lower noise level. The mass flow rate is directly proportional to the performance, and pressure drop of the axial fan. The present work is carried out by considering a range of angles of (0º to 6º) for its rotor blade using trial and error in the CFD technique, we observe the axial fan handles the good volume of air at relatively low pressure and delivers good efficiency in the output airflow. Consequently, the axial fan is designed to operate on high static pressure. This manuscript consists of the computation of the aerodynamic performances of symmetrical blade profiles of a fully axial fan by Computational Fluid Dynamics (CFD) methods, developing a methodology for the design of axial fans, and analysis of the designed fan with CFD methods.

Keywords: Axial fan, Pressure gain, Velocity streamline, Computational Fluid Dynamics (CFD), Mass flow rate.

Title: Analysis and Validation of Blade with Skewed Angle for Axial Fan

Author: L. H. Kenmogne Cheteu, W. Xu

International Journal of Mechanical and Industrial Technology      

ISSN 2348-7593 (Online)

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Abstract: This paper makes use of Jumarie’s modified Riemann-Liouville (R-L) fractional derivatives to study fractional Newton’s law of cooling. The methods we used include a new multiplication, separation of variables, and chain rule for fractional derivatives. In addition, Mittag-Leffler function plays an important role in this paper, which is similar to the exponential function in classical calculus. On the other hand, an example is provided to illustrate our result. 

Keywords: Jumarie’s modified R-L fractional derivatives, fractional Newton’s law of cooling, new multiplication, separation of variables, chain rule for fractional derivatives, Mittag-Leffler function, exponential function.

Title: Study on Fractional Newton’s Law of Cooling

Author: Chii-Huei Yu

International Journal of Mechanical and Industrial Technology       

ISSN 2348-7593 (Online)

Research Publish Journals