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Kondaraju, Sasidhar,Farhat, Hassan,Lee, Joon Sang The Royal Society of Chemistry 2012 Soft matter Vol.8 No.5
<P>Predicting the rheological properties of emulsions is one of the most challenging and complicated problems in material and fluid sciences. Substantial complications in prediction of rheology arise due to the deformability and aggregation of emulsions. Thus a better understanding of deformation and aggregation of emulsions can lead to a better understanding of the shear thinning region of emulsions. Though numerous experimental and theoretical studies were performed to obtain rheological correlations of emulsions, their inability to visualize and understand the droplet deformation in the presence of large volume fractions has stagnated our understanding of the shear thinning behavior of emulsions. With the aid of a numerical tool, which can help in visualizing the droplet deformation and correlate it to rheological behavior of emulsions, we have made an attempt to understand the physics behind the shear thinning behavior and also predict its rheological characteristics for emulsions at different volume fractions. In this article, we try to obtain a theoretical understanding of the influence of deformation and de-aggregation of droplets on the emulsion rheology. Simulations performed in this article using a multi-component lattice Boltzmann model are used to quantify (a) relative viscosity of emulsions with change in shear rate, (b) relative viscosity of emulsions with change in time, (c) effect of deformation of droplets on the shear thinning region in emulsions, and (d) relative viscosity of emulsions with change in volume fraction.</P> <P>Graphic Abstract</P><P>This work discusses the effects of deformation and aggregational characteristics of droplets on the rheological behavior of emulsions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1sm06193c'> </P>
Investigation of heat transfer in turbulent nanofluids using direct numerical simulations.
Kondaraju, Sasidhar,Jin, E K,Lee, J S Published by the American Physical Society through 2010 Physical review. E, Statistical, nonlinear, and so Vol.81 No.1
<P>A numerical study has been performed by using a combined Euler and Lagrangian method on the convective heat transfer of Cu and Al2O3 nanofluids under the turbulent flow conditions. The effects of volume fraction of nanoparticles, nanoparticle sizes, and nanoparticle material are investigated. The mechanism of convective heat transfer enhancement in nanofluids has also been investigated, by studying the influence of particle dispersion and two-way interaction between fluid and particle temperature. The results show significant enhancement of heat transfer of nanofluids. The numerical data are compared with the correlation data of the experiments and reasonably good agreement is achieved.</P>
Two-phase numerical model for thermal conductivity and convective heat transfer in nanofluids
Kondaraju, Sasidhar,Lee, Joon Sang Springer 2011 NANOSCALE RESEARCH LETTERS Vol.6 No.1
<P>Due to the numerous applications of nanofluids, investigating and understanding of thermophysical properties of nanofluids has currently become one of the core issues. Although numerous theoretical and numerical models have been developed by previous researchers to understand the mechanism of enhanced heat transfer in nanofluids; to the best of our knowledge these models were limited to the study of either thermal conductivity or convective heat transfer of nanofluids. We have developed a numerical model which can estimate the enhancement in both the thermal conductivity and convective heat transfer in nanofluids. It also aids in understanding the mechanism of heat transfer enhancement. The study reveals that the nanoparticle dispersion in fluid medium and nanoparticle heat transport phenomenon are equally important in enhancement of thermal conductivity. However, the enhancement in convective heat transfer was caused mainly due to the nanoparticle heat transport mechanism. Ability of this model to be able to understand the mechanism of convective heat transfer enhancement distinguishes the model from rest of the available numerical models.</P>
Vidyadhara Suryadevara,Sasidhar Reddyvallam Lankapalli,Lakshmi Harika Danda,Vijetha Pendyala,Vijetha Katta 한국한의학연구원 2017 Integrative Medicine Research Vol.6 No.3
Background: In the present investigation, an attempt was made to isolate starch from jackfruit seed powder and utilize it as a superdisintegrant to design fast dissolving tablets of irbesartan. Methods: Starch was isolated from jackfruit seeds via aqueous and alkali extraction processes and evaluated for its physicochemical properties, for phytochemical tests, and for acute toxicity studies. Irbesartan fast dissolving formulations were prepared using the wet granulation technique. Results: Acute toxicity studies for the extract indicated that all rats were healthy with no physiological changes in their behavior. The prepared irbesartan tablet formulations were found to be stable according to the Indian Pharmacopoeia-specified limits for postcompression parameters. From in vitro dissolution studies, it was observed that formulations F5 and F8 containing 5% w/w of alkali extracted starch and 5% w/w of croscarmellose sodium showed faster disintegration and improved dissolution rate compared with the other formulations. Fourier transfer infrared spectroscopic and differential scanning colorimetric analysis performed on optimized formulations indicated that there were no major interactions between the drug and excipients. Accelerated stability studies carried out on optimized formulations showed all tablets to be stable. Conclusion: The tablets prepared from jackfruit seed starch as superdisintegrant were found to be suitable for preparation of fast dissolving tablets.
Aljasser, Ibrahim Abdullah,Sasidhar, Bokkasam Kyung Hee University Management Research Institute 2019 Asia pacific journal of business review Vol.4 No.1
Service quality is a competitive weapon in the banking industry. Better understanding of customer's perception of service quality in the banking industry and the drivers of such perceptions will be a sound basis for continuous improvement in the quality of service offered to customers, customer satisfaction and customer retention in the industry. An earlier study by the same authors (Ibrahim and Bokkasam, 2016) revealed that the six SERVQUAL determinants are significantly related to and explain about 84% of overall customer satisfaction. It was also observed that the female customers perceived higher level of positive perception towards SERVQUAL determinants. The present study carries out a micro-analysis of the influence of gender on the constituents of the service quality and customer satisfaction for all the six dimensions of the SERVQUAL: Access, Communication, Competence, Tangibility, Empathy and Reliability, in Saudi banking sector. The study also analyses gender-wise levels of satisfactions with regard to individual components constituting various factors of the constituents of SERVQUAL. It was observed that the male customers have significantly low levels of satisfactions with regard to promptness in solving conflicting issues and comfort during waiting time in the bank.
Seshagirirao, Kottapalli,Leelavathi, Chaganti,Sasidhar, Vemula Korean Society for Biochemistry and Molecular Biol 2005 Journal of biochemistry and molecular biology Vol.38 No.3
A cross-linked leucaena (Leucaena leucocephala) seed gum (CLLSG) matrix was prepared for the isolation of galactose-specific lectins by affinity chromatography. The matrix was evaluated for affinity with a known galactose-specific lectin from the seeds of snake gourd (Trichosanthes anguina). The matrix preparation was simple and inexpensive when compared to commercial galactose-specific matrices (i.e. about 1.5 US$/100 ml of matrix). The current method is also useful for the demonstration of the affinity chromatography technique in laboratories. Since leucaena seeds are abundant and inexpensive, and the matrix preparation is easy, CLLSG appears to be a promising tool for the separation of galactose-specific lectins.
Yoon, Hong Min,Kondaraju, Sasidhar,Lee, Jung Shin,Suh, Youngho,Lee, Joonho H.,Lee, Joon Sang Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.409 No.-
<P><B>Abstract</B></P> <P>Recent studies have revealed that contact line forces play an important role in the droplet spreading process. Despite their significance, the physics related to them has been studied only indirectly and the effect of contact line forces is still being disputed. We performed a molecular dynamics simulation and mimicked the droplet spreading process at the nanoscale. Based on the results of the simulation, the contact line forces were directly calculated. We found that the forces acting on the bulk and the contact line region showed different trends. Distinct positive and negative forces, contact line spreading, and friction forces were observed near the contact line. We also observed a strong dependency of the atomic kinetics in the contact line region on the variations in the contact line forces. The atoms of the liquid in the contact line region lost their kinetic energy due to the contact line friction force and became partially immobile on the solid surface. The results of the current study will be useful for understanding the role of the contact line forces on the kinetic energy dissipation in the contact line region.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Contact line forces, including friction and spreading forces are directly calculated. </LI> <LI> Overall trends of variations in contact line forces during droplet spreading process show characteristics of contact line forces. </LI> <LI> Detail relations of contact line forces and atomic kinetics in the contact line provide a clear evidence of the possible energy dissipation mechanism in droplet spreading process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>