Indian Institute of Technology Ropar

About: Indian Institute of Technology Ropar is a education organization based out in Ropar, India. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 1014 authors who have published 2878 publications receiving 35715 citations.

Magnetohydrodynamic peristaltic flow of a couple stress fluid through coaxial channels containing a porous medium

Abstract: This article studies the hydromagnetic peristaltic flow of couple stress fluids through the gap between two concentric channels containing a Darcian porous medium, with the inner channel being rigid. A sinusoidal wave propagates along the outer channel. Long wavelength and low Reynolds number assumptions are used. The effects of couple stress parameter, magnetic field, permeability, and the channel ratio width on pressure and frictional forces on the inner and outer channels are depicted graphically. Mechanical efficiency and trapping are also studied. Pressure diminishes with increasing coupling and permeability parameters whereas it increases with Hartmann number and channel width ratio. Applications of the model include transport of complex bio-waste fluids and magnetic field control of gastro-intestinal disorders.

Performance of cold sprayed Ni based coatings in actual boiler environment

Abstract: Hot-corrosion combined with erosion-corrosion is a severe problem in boiler tubes of Power Plant Boilers. One possible way to control hot corrosion is the use of thermal spray protective coatings. Cold gas dynamic spraying (CGDS), popularly referred to as cold spray (CS), is a promising technology for depositing protective coatings. Ni based alloys have been used for thermal spraying for various applications. In the current research work three different types of coatings NiCr, NiCrTiC and NiCrTiCRe were deposited by the cold spray technique on SA 516 steel. The performance of the coatings was evaluated in actual boiler conditions wherein the uncoated and coated steels were exposed to the superheater zone of a coal fired boiler for 15 cycles. The change in weight and thickness were noted and used for studying the kinetics of the erosion-corrosion. X-ray diffraction, surface and cross-sectional FE-SEM/EDS and X-ray mapping techniques were used to evaluate the as-coated and eroded-corroded specimens. It was observed that the coated specimens gave better performance than the uncoated steel. The development of oxides and spinels of nickel and chromium might have resulted in better performance of the coatings. The NiCrTiCRe coating established best erosion-corrosion resistance behavior amongst all the investigated specimens.