Journal of Mechanical Engineering

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The Effect of The Unsteady Flow Around A Triangular Cylinder (Bluff) at Small Values of Flow Velocity

Dr. Muna S. Kassima* , Nihad Al-zuabidib 

a School of Engineering University of Mustansirirya Baghdad, Iraq 

b School of Engineering University of Guelph Guelph, Ontario, Canada 

Keywords: Unsteady flow, bluff body, attack angle, frequency 

Abbreviations: AFTT: Air flow Testing Tunnel, Re: Reynolds number, ρ: fluid density, U: flow velocity, ν: Poisson’s Ratio, A: Amplitude of vibration, m: bluff mass , ms: Mass spring : Cylinder position, velocity and acceleration, cs : Damping coefficient, ks: Stiffness coefficient of spring, Fvs(t): External force, FL: Lift force, FD: Drag force, CL: Lift coefficient.CD: Drag coefficient, D: width bluff, v: Kinematic viscosity, fn : Natural requency, fv :Shedding vortex frequency, St: Strouhal number, ζs: Damping coefficient, : Natural frequency, r: Damping ratio, ϕ :Phase angle , t :Time 


Citation: 

Nihad Al-zuabidi, Dr. Kassim M.S. 2016. The Effect of The Unsteady Flow Around A Triangular Cylinder (Bluff) at Small Values of Flow Velocityd. Journal of Mechanical Engineering. Photon 126, 232-243 

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Photon Ignitor: ISJN29518372D826323042016

Abstract 

The unsteady flow around a bluff body has some effects depends on the shape of the bluff (circular, square or triangular cylinder), and the attack angles as well. When the flow is at small values of flow velocities around (0.3- 1.3), the bluff’s behavior are changing clearly with changing the velocity of flow and attack angles. In engineering fields there are many applications for this type of flow around bodies. Some of those application is in a heat exchanger and flame holders which need using this type of flow sometimes. In this paper the behavior of triangular cylinder which placed in a fluid stream is presented. The vortex shedding behind the model increases with increasing the characteristics of flow. The effects of velocity due to small Reynolds number value comparing with its values at high values of velocities were depending of the frequency of model and attack angle. The data that are collected form laser sensor which is placed beside the model, are used in this study and for three values of attack angle, 0, 30 and 60 degree, are shown that the behavior of the bluff body doesn’t change clearly with increasing the flow speed from 0.4 m/s to 1.3 m/sec and changing the attack angle doesn’t have significant effects as well. The curves are showing that the vibration amplitude of model increases slightly with increasing flow velocity ( . The oscillating frequencies of the model, during the test, was changed from 1Hz to 1.3 Hz that means it has a good effects on the performance of the heat exchanger maybe uses. The fluid that is taken in this study was the air at room temperature condition with absolute Viscosity =1.983 x 10-5 m2/s As a results the performance of heat exchangers that operate with a slow values of flow speed is changing due to change the values of speed and attack angles that means there is some observe effect at low values of Reynolds number. The behavior of the bluff was unclear in this rang of Reynolds number values. 


 

Gratitude of Six-Sigma: A Case Study of Manufacturing Environment 

Prabhakar Kaushika*, Prikshitb, Kapil Mittalc 

a UIET, Maharshi Dayanand University, Rohtak, Haryana, India, 124001 

b UIET, Maharshi Dayanand University, Rohtak, Haryana, India, 124001 

c Mechanical Engineering Department, Faculty of Engineering & Technology, Gurukul Kangri University, Haridwar, Uttarakhand, India, 249404

Prabhakar Kaushik, Prikshit and Kapil Mittal  are conferred with Louis Pasteur Research Award-2015 in Mechanical Engineering

Keywords: Six-Sigma, Manufacturing Industry, Process Capability 

Photon Ignitor: ISJN29518372D827812022016 

Citation: Kaushik P., Prikshit., Mittal K., 2016. Gratitude of Six-Sigma: A Case Study of Manufacturing Environment. Journal of Mechanical Engineering. Photon 126, 223-231 

Abstract 

Six-Sigma across small and medium sized enterprises (SMEs) is swiftly evolving as the new trend of revolution in Six Sigma. This paper reviews the implications of applying Six Sigma methodology over a tractor part manufacturing unit. The study helps in achieving high quality products and services at low cost. The methodology adopted is DMAIC methodology of Six Sigma which had been mostly successful so far across the globe. In this study the product under consideration is gearbox. The industry was facing an almost 100% rework problem in the gearbox it produces. By the application of Six-Sigma DMAIC methodology industry was able to reduce the rework rate under Six-Sigma level i.e. 3.4 PPM. The success of this study paves the way to further extend the Six Sigma application to more such industries working in similar environment. The study will yield a great value to academics, consultants, researchers and practitioners of Six Sigma.







Analysis of Al2O3 Nanofluid as Future Coolant for Internal Combustion Engine 


Mr. Bharat Singh*, Dr. Mahendra Pratap Singh 


Department of Mechanical Engineering Jagannath University, Jaipur, 303901, India 



Keywords: Engine cooling, convection, radiator, Nano fluid 


Abbreviations: H- height of radiator, W- width of radiator, Thfin- thickness of fin, Pfin- pitch of fin Dfin- seperation between two adjacent tubes or height of fin , Lout- depth of radiator Dout- height of tube , Th- tube wall thickness , mh- rate of water flow through a tube TH in- hot fluid inlet temperature, TH out- hot fluid outlet temperature, TC in- cold fluid inlet temperature, TC out- cold fluid outlet temperature, Nt- total number of tubes ,Vc- average velocity of air in the core 


Photon Ignitor: ISJN29518372D788526092015 


Citation: Gurjar B.S., Mahendra S., 2015. Analysis of Al2O3 Nanofluid as Future Coolant for Internal Combustion Engine. Journal of Mechanical Engineering . Photon 125, 218-222 


Abstract 

The goal of this paper is to design an advanced engine cooling system that will be compact in size and dissipate more heat. Internal combustion engines are fitted with a cooling system which is responsible for removing certain heat from the engine and keeps the engine from overheating. This cooling system requires a large space to meet cooling need and also have limited heat dissipation. The compact shape will allow for alternate system placement options within the engine compartment and better heat dissipation maintain engine thermal efficiency.


Dr. Manal H. AL-Hafidh and Babasaheb N. Dole from Iraq receive Darcy Research Award-2015 in Heat Transfer