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  • 1
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    A Study of Thermal Stability And Crystallization Kinetics of SbSeGe Glassy Alloys (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-09-05
    Description: Alloys of Sb 10 Se 90-x Ge x ( x = 0, 19, 21, 23, 25, 27) have been prepared using melt quenching technique. Differential thermal analysis has been used to determine the three characteristic temperatures, glass transition ( T g ), glass crystallization ( T c ) and melting temperature ( T m ), at four heating rates 5, 10, 15 and 20 K/min. The thermal stability and ease of glass formation have been evaluated in terms of Hruby parameter and reduced glass transition temperature respectively. The activation energy for glass crystallization ( E c ) has been calculated using Kissinger's method and Marseglia theory. The composition dependence of T g and E c has also been discussed.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Computational Study of Convective Heat Transfer in Circular Pipe using Trapezoidal Ribs (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-09-09
    Description: Perturbations or interruptions provided in the passage of heat exchanger generate the vortices downstream. The formation of these natural vortices, augment local heat transfer abruptly. The effect on convective heat transfer enhancement and friction characteristics by providing trapezoidal ribs inside a circular pipe is computationally investigated in detail. Different variations of height, width and pitch of the ribs are used to optimize the rate of heat transfer through the pipe. Liquid water is employed as the working fluid. Input parameters of Reynolds Number ranging from 5000-60000 with axial flow along the pipe and constant heat flux of 50 W/cm 2 to the pipe surface is used. After validation with the existing literature, Realizable k-ε turbulent model with enhanced wall function is used in commercial CFD software ANSYS FLUENT. The outcome of the investigation shows that the ribs provided on the inside of the pipe surface enhance the turbulence in the flow and pro...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    Solidification of Cu-Water nanofluid in a trapezoidal cavity: A CFD study (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-09-24
    Description: A numerical study has been carried out to investigate the solidification of a binary mixture of water and Cu nanoparticles inside a horizontal trapezoidal cavity of different aspect ratio under specific given boundary conditions for temperature and concentration gradients. The vertical side walls of the cavity are insulated while the top wall temperature is kept lower than that of the bottom wall. The effect of parameters such as the ratio of the cavity length to height (aspect ratio), the cold wall temperature (-5 to -30 °C) and the initial temperature of the nanofluid (0 °C to16 °C) on solidification time is investigated. The moving solid-liquid interface is obtained using Enthalpy-porosity technique in the model. We found that the solidification time decreases with the increase of the aspect ratio (i.e., a longer trapezoidal cavity) and the decrease of cold wall temperature. Aspect ratio is found to give a prominent effect. However, the initial temperature of fluid does not af...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 4
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    Design and Development of Peristaltic Soft Robot Using Shape Memory Alloy Actuators with different control strategies (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-07-31
    Description: This paper presents design, development and different optimal control strategies for a spiral, shape memory alloy (SMA) actuators for robotics applications. The actuator material used is thermally activated Ni-Ti SMA which exhibits high torque capacity. SMA based actuators are widely used in robotics applications because of their large energy density and super-elasticity. Here describe the multi-direction movement of soft robot based on SMA actuators. To controlling precise position in minimum time for SMA actuator suitable controller require. Here we investigated the different ideal controlling method for design soft robot model. The Control strategies for soft robot developed using Matlab Simulink; here we investigate P, PI, PD and PID types of controller. For real-time controller implementation we compare the controller responses with respect to the desired set point of operating robot. Thus, we can identify the PID controller is suitable for real-time designing the soft robo...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 5
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    Generation of high power sub millimeter radiation using free electron laser (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-03-29
    Description: We have developed an analytical formalism to study the emission of high power radiation lying in the sub millimetre range. A relativistic electron beam (REB) is velocity modulated by the pondermotive force exerted by the laser beams. After passing through the drift space, the beam gets density modulated which further interacts with the strong field wiggler and acquires a transverse velocity that couples with the modulated density of the beam in the presence of ion channel which contribute to the non-linear current density which further leads to the emission of the radiation. The output radiation can be modified by changing the wiggler parameters and the energy of the electron beam. The power of the output radiation is found to increase with the modulation. The obtained radiation can be employed for various applications.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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