Indian Institute of Technology Guwahati

About: Indian Institute of Technology Guwahati is a education organization based out in Guwahati, Assam, India. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 6933 authors who have published 17102 publications receiving 257351 citations.

Silica Nanoparticle Assisted Polymer Flooding of Heavy Crude Oil: Emulsification, Rheology, and Wettability Alteration Characteristics

Abstract: Polymer flooding based enhanced oil recovery (EOR) has been proven to be effective and successful for heavy crude oil systems due to its ability to achieve favorable mobility ratios driven by viscosity alterations. Nanoparticles have the potential to intensify favorable mobility ratios as well as various other mechanisms responsible for EOR. This work addresses the interfacial tension (IFT), emulsification, and rheological and wettability alteration characteristics of silica nanoparticle (SNP) assisted polymer flooding. The stability of the xanthan gum–SNP system was evaluated by a particle size analyzer and zeta potential method. The rheological behavior of the system in addition to IFT and the emulsification mechanism at variant temperatures were also investigated. Wettability alteration studies involved contact angle measurements for oil drops with respect to a nanoparticle saturated rock surface. SNP assisted polymer flooding enabled higher oil recovery of 20.82% at 30 °C and 18.44% at 80 °C due to IF...

Printed monopole antenna with tapered feed line, feed region and patch for super wideband applications

Abstract: A novel and compact super wideband (SWB) exponentially tapered feed region and patch printed monopole antenna is proposed. This antenna is fed by a 50-Ω triangular tapered feed line. The antenna operates over a bandwidth of 2.5-80 GHz with a return loss of 10 dB or more. The dimensions of the proposed antenna are 40 × 30 × 1.6 mm 3 . An exponential curve is employed in the feed region and a triangular tapered feed line is used. The ground plane feed gap is optimised to 1.3 mm. The proposed tapered monopole antenna has demonstrated an ultra-large bandwidth with satisfactory radiation properties. Two particular antennas are examined, one with a rectangular feed line and another with a triangular tapered feed line. The performance of the antenna in frequency domain is investigated, and a good agreement is achieved between the simulation and experimental results. In addition, the time domain characteristics of the proposed antenna are evaluated experimentally. This antenna can be used in ultra-wideband or SWB applications.