Browsing by Author "Shah Alam, Mohammad"

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    Effect of high pressure coolant jet on temperature, chip and cutting forces in turning stainless steel by coated carbide insert
    (Department of Industrial and Production Engineering, BUET, 2008-02) Shah Alam, Mohammad; Nikhil Ranjan Dhar, Dr.
    High production machining, inhcrenlly generates large amount of heat leads to high culling zone temperature for its higher ~ulting vdocity, feed and depth of cut. Such hi gil ell Lling \cmp",alllfc if not reduced impairs surface integrity of th.o product arid reduce dimeMional accuracy as well as tool life. Conventional cutting fluid can not maintain (his silllutjOl1 properl}'_ Though in lower velocity a smnll amount of [luld enter in to the llllcrtoce lor its capillary action bllt in higher \'clo~ily it is nol evident. As cutting !luid can not r~ach into the chip-lOO! and work-tool inlerface due to low pressure and low boiling temperature, it cannot effectively lubricate and cool the tool and job. Low boiling temperatme cause vapori7alion of cutting fluid and prevent it to enter into cutting interface making a harrier to flow, High-pn:ssuTC coolant (HPC) jd is an effective alternative to reduce temperature anti tool wear. HPC jet applied diagonally to thc in5ert~ cutting edgc remOves heat and reduce tool wear and also provide better lubrication in the lool tip and culliL1~int~rf"ce. Keeping these in view, obje~live of the present work is to m'lk~ an experimental investigation on the role of high pressure cool ing jet in tuming stainless steeL
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    STUDY THE IMPACT OF HEAT GENERATION AND VARIABLE VISCOUS EFFECT ON STRETCHING SHEET IN PRESENCE OF MAGNETIC FIELD WITH VARIABLE THERMAL CONDUCTIVITY
    (R&D Wing, MIST, 2015-03) Shah Alam, Mohammad; Ali, Mohammad; Abdul Alim, Dr. Md
    The aim of the study is to investigate the effect of variable viscosity and thermal conductivity on unsteady MHD boundary layer flow of an incompressible, electrically conducting and viscous fluid over a stretching sheet with heat generation by Quasi-linearization technique. The governing partial differential equations are transformed into ordinary differential equations by using similarity transformation and stretching variable. The governing momentum boundary layer and thermal boundary layer equations with the boundary conditions are transformed into a system of first order ordinary differential equations which are then solved numerically by using Runge-Kutta fourth-fifth order method along with shooting technique. The effects of the flow parameters on the velocity, temperature, shearing stress and rate of heat transfer are computed discussed and have been graphically represented in figures and Table-1 and Table-2 for various values of different parameters. The results presented graphically illustrate that velocity field decrease due to increasing of Magnetic parameter, unsteadiness parameter and heat source parameter and reverse trend arises for the increasing values of variable viscosity parameter and variable thermal conductivity parameter. The temperature field decreases for the effect of variable viscosity parameter and variable thermal conductivity parameter but the temperature field increases for the increasing values of magnetic parameter, unsteadiness parameter, heat source parameter, whereas for the effect of Prandtl number the temperature profile is increased on the surface of the plate and decreased away from the plate.