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Palani, S.,Raja, S.,Sakthivel, K.,Devi, K.,Kumar, B. Senthil Kyung Hee Oriental Medicine Research Center 2010 Oriental pharmacy and experimental medicine Vol.10 No.1
The present study was aimed to investigate the hepatoprotective and antioxidant activities of ethanol extract from Monochoria vaginalis (250 mg/kg and 500 mg/kg B/W) on acetaminophen (APAP) induced rat hepatic injury. Monochoria vaginalis is a traditional medicinal plant that is commonly used to treat and improve liver conditions in India and other Asian countries. The development of hepatotoxicity induced by APAP is promoted by oxidative stress. APAP treated group significantly (P < 0.01) elevated the serum enzymatic levels like glutamate oxaloacetate transaminase, glutamate pyruvate transaminase, alkaline phosphatase (SALP), total bilirubin and malondialdehyde (MDA), which were restored towards normalization significantly (P < 0.01) thanol extract of yonochoria vagin is (EEMV). In addition, the EEMV significantly (P < 0.01) elevated the decreased level of total protein and antioxidant enzymes such as superoxide dismutase, catalase, glutathione peroxidase, glutathione-s-transferase and reduced glutathione. Apart from these, histopathological changes also showed the protective nature of the EEMV against APAP induced hepatic damage in liver tissues. The activity of EEMV at 500 mg/kg B/W was comparable to the standard drug silymarin (25 mg/kg B/W). In conclusion, these data suggest that the EEMV possess hepatoprotective and antioxidant effects against APAP-induced hepatotoxicity and oxidative stress in rats.
Numerically integrated modified virtual crack closure integral technique for 2-D crack problems
Palani, G.S.,Dattaguru, B.,Iyer, Nagesh R. Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.18 No.6
Modified virtual crack closure integral (MVCCI) technique has become very popular for computation of strain energy release rate (SERR) and stress intensity factor (SIF) for 2-D crack problems. The objective of this paper is to propose a numerical integration procedure for MVCCI so as to generalize the technique and make its application much wider. This new procedure called as numerically integrated MVCCI (NI-MVCCI) will remove the dependence of MVCCI equations on the type of finite element employed in the basic stress analysis. Numerical studies on fracture analysis of 2-D crack (mode I and II) problems have been conducted by employing 4-noded, 8-noded (regular & quarter-point), 9-noded and 12-noded finite elements. For non-singular (regular) elements at crack tip, NI-MVCCI technique generates the same results as MVCCI, but the advantage for higher order regular and singular elements is that complex equations for MVCCI need not be derived. Gauss numerical integration rule to be employed for 8-noded singular (quarter-point) element for accurate computation of SERR and SIF has been recommended based on the numerical studies.
Theoretical and Computational Analysis of LNG Evaporator
Palani Kumar Chidambaram,Seok Woo Son,Heuy Dong Kim(김희동),Dong Wook Kim(김동욱),Yang Myung Jo(조양명) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Theoretical and numerical predictions on fluid flow and heat transfer in a typical LNG evaporator is performed. Methane is used in lieu of LNG as it constitutes over 80% of LNG. The theoretical predictions are performed by simple energy balance between the steam and methane. This is augmented by the mass transfer between the liquid phase methane and gas phase methane. The theoretical predictions are made to calculate the pressure drop and temperature drop in the steam tubes. Numerical simulations are carried out by solving the governing equations of multiphase flow in a portion of the evaporator domain with a single layer of steam pipe. The basic flow equations of continuity, momentum and energy equations form the governing equations along with equations of species transport. Multiphase modelling is incorporated using VOF method. Liquid methane is taken as primary phase. It vaporizes into gaseous methane which is taken to be secondary phase. Steam is taken as another secondary phase which flows through the heating coils. Closure for turbulence is modelled by a two equation turbulence model. Both the analytical and numerical predictions match well with each other. Further parametric studies are planned based on the current research.
Alternating and Merged Droplets in a Double T-junction Microchannel
Harish Palani Naga Surya,Sajeesh Parayil,Utsab Banerjee,Subhash Chander,Ashis Kumar Sen 한국바이오칩학회 2015 BioChip Journal Vol.9 No.1
In this work, we report experimental andnumerical studies of alternating and merged dropletsin a double T-junction microchannel. The microchanneldevice is fabricated using PDMS substrate and experimentsare performed with mineral oil with surfactantas the continuous phase and aqueous glycerol asthe discrete phase. Based on the flow rate fraction φand Capillary number Ca, four different flow regimesare identified: merging, stable alternating droplets, alternatingdroplets with transition and laminar. A numericalmodel that employs volume-of-fluid formulationsis used to predict the alternating droplet generationprocess. In the stable alternating droplet regime,the effect of the discrete phase flow rate ratio α on thedroplet diameter ratio β is experimentally studied andcompared with that predicted from the simulations. Itis observed that the droplet diameter ratio β increaseslinearly with increase in the flow rate ratio α and agood match between experiments and simulations isobserved. The diameters of droplets at different Capillarynumbers Ca generated using single and doubleT-junction microchannels are compared and it is observedthat, at low Ca, the double T-junction generateslarger droplets as compared to single T-junction. In merged droplet regime, the effect of the continuousphase flow rate Qc and discrete phase viscosity μd ondiameter dm and interdistance between the droplets λof the merged droplets are studied. It is observed thatthe merged droplet diameter dm is reduced and interdistancebetween the droplets λ increases with increasein the continuous phase flow rate Qc. As the viscosityof the discrete phase μd increases, the diameter dm andinterdistance between the droplets λ of the mergeddroplets decreases.
On fuzzy faintly pre-continuous functions
G. Palani Chetty,G. Balasubramanian 영남수학회 2008 East Asian mathematical journal Vol.24 No.4
The aim of this paper is to introduce a new generalization of fuzzy faintly continuous functions called fuzzy faintly pre-continuous functions and also we have introduced and studied weakly fuzzy precontinuous functions. Several characterizations of fuzzy faintly pre-continuous functions are given and some interesting properties of the above functions are discussed.
G.Palani,김광용 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.6
A study of the velocity and thermal boundary layers on a semi-infinite inclined plate with temperature oscillations ispresented in this work. The non-linear, coupled parabolic integro-partial differential equations governing flow and heat transfer have been solved numerically using an implicit finite difference scheme of Crank-Nicolson type. The numerical values for the flow field, temperature, shearing stress, and heat transfer coefficients are presented in a graphical form. It is observed that the velocity and temperature profiles decrease as the frequency parameter increases.
Performance and emission characteristics of biodiesel-blend in diesel engine: A review
Yogesh PALANI,Chandramohan DEVARAJAN,Dhanashekar MANICKAM,Sathish THANIKODI 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.1
Many researchers delve for an alternative fuel to overcome the fossil fuel crisis. Developed countries have embarked focus on renewable energy like wind energy, geothermal, biofuel, ocean energy and solar energy. Biodiesel is considered to be one of the most felicitous one kinds of renewable energy with similar properties of diesel fuel. Biodiesel is gaining prominence due to the global fossil fuel crisis and emission control challenges. Biodiesel blends are formulated in numerous proportion with diesel to run the diesel engine and it has significantly reduced the harmful pollutants from contaminating the environment. This review paper summarizes the outcome of biodiesel blends on properties, performance and emission-quality of a diesel engine under different operating conditions. Results from the literature provide a comparative data between conventional diesel and diesel-biodiesel blend which indicates that the diesel-biodiesel blend provides shorter ignition delay and lesser heat release rate as well as slightly higher efficiency. The emissions like CO, HC and particulate matter are reduced while choosing biodiesel blends. Biodiesel blend with additives such as alcohol can be the appropriate solution for the fuel crisis. Finally, the review concludes the advantages and future scope of biodiesel as a better competent for diesel fuel.