Wire coating is an important industrial process as it provides insulation and mechanical strength. The most important plastic resins used in coating of wires are plasticized polyvinyl chloride (PVC) ...and low/high density polyethylene (LDPE/HDPE), nylon and polysulfone. The designs of wire coating die are of fundamental importance as these affect the final product after processing. In the present study wire coating is performed using melt polymer satisfying third grade fluid model. The novelty of this study is to analyze the effect of a radial magnetic field and varying temperature dependent viscosity on the wire coating. In our discussion we have considered (i) Reynolds model (ii) Vogel’s model to account for temperature dependent viscosity. We have investigated the flow in a pressure type die. The equations characterizing the flow and heat transfer phenomena are solved numerically and the effects of emerging parameters are shown with the help of graphs. It is interesting to remark that an increase in non-Newtonian parameter increases the velocity in the absence of magnetic field which coincides with the results reported earlier but in the presence of magnetic field the velocity decreases in the entire span of the flow domain. Further, the flow instability in the flows of extrusion die is well marked in case of Vogel’s model as pointed out by Nhan-Phan-Thien.
An analysis is made for the unsteady magnetohydrodynamic (MHD) flow of a viscous, incompressible, electrically conducting fluid in a porous medium. Considering the viscous dissipative term in energy ...equation which is important in free convective flow. The coupled non-linear partial differential equations are solved by using an implicit finite difference method of Crank Nicolson type. The effects of chemical reaction, viscous dissipation and radiation on velocity, temperature and concentrations are discussed. More importantly, the results of numerical solution of the present study agree well with the analytical solution of the earlier study in a particular case (i.e. without viscous dissipation). It is interesting to note that the Hartmann number reduces the velocity at all points of the flow domain as expected. An increase in viscous dissipation contributes slightly but uniformly to the rise of temperature as well as velocity distribution.
A mixed convective momentum and heat transfer in a composite system, consisting of electrically conducting fluid and saturated porous medium in a vertical channel, have been studied. The flow, ...subjected to a linearly varying space dependent wall temperature engenders a convection current in the flow domain. The present study accounts for the effects of viscosities, and electrical conductivities of both the regions. The Brinkman model has been used to model the flow through porous region. The novel results of the analysis are: the simulation of external magnetic field (control input) in porous region affects momentum transport in both the regions; the amount of resistivity developed in primary velocity due to application of magnetic field can be experienced in the clear-fluid region by applying nearly 50 percent less magnetic field strength in conjunction with requisite porosity of the saturated porous medium; porous matrix is having higher thermal diffusivity than clear fluid provided bounding surfaces are of the same material.
Aqueous extract of the fruits of
Solanum xanthocarpum Schrad. & Wendl. (Solanaceae) was investigated for hypoglycaemic activity in rats and mice. Screening for the hypoglycaemic activity was assessed ...on normoglycaemic, alloxan treated hyperglycaemic and glucose loaded rats along with in vitro study on glucose utilization by isolated rat hemidiaphragm. The various haematological and biochemical parameters were also studied. The extract was found to possess significant hypoglycaemic activity when compared with the reference standard glibenclamide. The in vitro study on glucose utilization by isolated rat hemidiaphragm suggests that the aqueous extract may have direct insulin like activity which enhances the peripheral utilization of glucose and have extra pancreatic effect. The toxicity studies report safety usage of the plant extract.
The present study considers the effect of heat and mass transfer on free convective flow of a visco-elastic incompressible electrically conducting fluid past a vertical porous plate through a porous ...medium with time dependent oscillatory permeability and suction in presence of a uniform transverse magnetic field and heat source. The novelty of the present study is to analyze the effect of time dependant fluctuative suction and permeability of the medium on a visco-elastic fluid flow. The necessity of the present analysis arises as the most industrial fluids exhibit the visco-elastic behavior. The coupled nonlinear partial differential equation are turned to ordinary by super imposing a solution with steady and time dependant transient part. Finally, the set of ordinary differential equations is solved with a perturbation scheme to meet the inadequacy of boundary condition. Elasticity of the fluid and the Lorentz force reduce the velocity and it is more pronounced in case of heavier species. Most interesting observation is the fluctuation of velocity appears near the plate due to the presence of sink and presence of elastic element as well as heat source reduce the skin friction.
This work focusses on deriving exact analytic solutions for an oscillatory flow of an elastico-viscous conducting fluid in a porous medium over a moving plate with variable suction. The momentum ...equation is enhanced with the resisting force offered by the permeability of the medium by incorporating the Darcy model. The energy transfer is equipped with volumetric heat generation/absorption and thermal radiation. Exact solutions for the governing equations are obtained by employing Cardan’s method, and comparative discussion is made by using the perturbation technique. The temperature distribution is evaluated by solving the energy equation considering relaxation time. Solutions of velocity fields are obtained for any value of viscoelastic parameter
k
1
. The results obtained from the analytical and approximation methods for any value of viscosity parameter are compared and found to be in good agreement. The physical behaviour of the pertinent parameters is obtained and displayed in graphs.
MALTA2 is a depleted monolithic active pixel sensor (DMAPS) developed in the Tower 180 nm CMOS imaging process. Monolithic CMOS sensors offer advantages over current hybrid imaging sensors both in ...terms of increased tracking performance due to lower material budget but also in terms of ease of integration and construction costs due to the monolithic design. Current research and development efforts are aimed towards radiation-hard designs up to 100 Mrad in Total Ionizing Dose and 3×1015 1 MeV neq/cm2 in Non-Ionizing Energy Loss. One important property of a sensor’s radiation hardness is the depletion depth at which efficient charge collection is achieved via drift movement. Grazing angle test-beam data was taken during the 2023 SPS CERN test beam with the MALTA telescope and Edge Transient Current Technique studies were performed at DESY in order to develop a quantitative study of the depletion depth for un-irradiated, epitaxial MALTA2 samples. The study is planned to be extended for irradiated and Czochralski MALTA2 samples.
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