Kalyani radha kadavakollu

EDUCATION

Ph. D. in 2009 from JNTU Hyderabad
M.Tech in 2004 from JNTUA College of Engineering Ananthapuramu
B.Tech in 2001 from Chaitanya Bharathi Institute of Technology, Hyderabad

RESEARCH INTERESTS

Thermal Engineering, IC Engines, Refrigeration & Air Conditioning, Heat Transfer

Scopus Publications

Impact of Fuel Injection Pressure and Compression Ratio on Performance and Emission Characteristics of VCR CI Engine Fueled with Palm Kernel Oil-Eucalyptus Oil Blends
K. Srinivas, B. Balu Naik, K. Kalyani Radha
Materials Today Proceedings, 2017
Eucalyptus-palm kernel oil blends: A complete elimination of diesel in a 4-stroke VCR diesel engine
Srinivas Kommana, Balu Naik Banoth, Kalyani Radha Kadavakollu
Journal of Combustion, 2015
Fuels derived from biomass are mostly preferred as alternative fuels for IC engines as they are abundantly available and renewable in nature. The objective of the study is to identify the parameters that influence gross indicated fuel conversion efficiency and how they are affected by the use of biodiesel relative to petroleum diesel. Important physicochemical properties of palm kernel oil and eucalyptus blend were experimentally evaluated and found within acceptable limits of relevant standards. As most of vegetable oils are edible, growing concern for trying nonedible and waste fats as alternative to petrodiesel has emerged. In present study diesel fuel is completely replaced by biofuels, namely, methyl ester of palm kernel oil and eucalyptus oil in various blends. Different blends of palm kernel oil and eucalyptus oil are prepared on volume basis and used as operating fuel in single cylinder 4-stroke variable compression ratio diesel engine. Performance and emission characteristics of these blends are studied by varying the compression ratio. In the present experiment methyl ester extracted from palm kernel oil is considered as ignition improver and eucalyptus oil is considered as the fuel. The blends taken are PKE05 (palm kernel oil 95 + eucalyptus 05), PKE10 (palm kernel oil 90 + eucalyptus 10), and PKE15 (palm kernel 85 + eucalyptus 15). The results obtained by operating with these fuels are compared with results of pure diesel; finally the most preferable combination and the preferred compression ratio are identified.
Development of a chest freezer-optimum design of an evaporator coil
K. Kalyani Radha, S. Naga Sarada, K. Rajagopal
International Journal of Automotive and Mechanical Engineering, 2012
In a country such as India, food grains, fruit, vegetables, meat, poultry and fish, are very susceptible to microbial contamination and spoilage and require stringent preservation methods. One such method is by the use of a chest freezer for the storage of frozen food. This investigation considers different loads and design parameters for the development of a chest freezer using R134a as the working fluid. Experimental designs of an evaporator coil, condenser coil and capillary tube are investigated through the development of storage periods in terms of steady state and cyclic performance, by optimising the quantity of refrigerant charge, with strict adherence to the standards and requirement for maintaining an internal temperature of -23 Â°C at 43 Â°C ambient. Cyclic load performance tests optimise the performance of individual components selected for the design of a chest freezer. The system selection has a highly balanced performance with R134a and showed 118 kJ/kg cooling capacity with 8.42 coefficient of performance (COP). By the replacement of R134a, temperatures of -23 Â°C are maintained inside the freezer cabinet with low power consumption and an increase in the net refrigerating effect, which in turn increases the COP. The system design has optimum efficiency with moderate costs by optimising the length and diameter of the evaporator coil, i.e., 34.15 m and 7.94 mm, respectively.
Augmentation of turbulent flow heat transfer in a horizontal tube with varying width twisted tape inserts
S. Naga Sarada, A.V. Sita Rama Raju, K. Kalyani Radha, L. Syam Sunder
International Journal of Automotive and Mechanical Engineering, 2012
The present work shows the results obtained from experimental investigations of the augmentation of turbulent flow heat transfer in a horizontal tube by means of varying width twisted tape inserts, with air as the working fluid. In order to reduce excessive pressure drops associated with full-width twisted tape inserts, with a lower corresponding reduction in heat transfer coefficients, reduced-width twisted tapes of widths ranging from 10 mm to 22 mm are used, which are lower than the internal diameter of the tube of 27.5 mm. Experiments were carried out for plain tubes with/without twisted tape inserts at a constant wall heat flux and different mass flow rates. The twisted tapes are of three different twist ratios (3, 4 and 5), each with five different widths (26 (full-width), 22, 18, 14 and 10 mm). The Reynolds number varied from 6000 to 13500. Both the heat transfer coefficient and pressure drop are calculated, and the results are compared with those of a plain tube. It is observed that with the inclusion of twisted tape inserts there is a significant increase in the heat transfer coefficients. Correlations are developed for friction factors and Nusselt numbers for a fully-developed turbulent swirl flow, which are applicable to full-width as well as reduced-width twisted tapes, using a modified twist ratio as the pitch to width ratio of the tape.
Performance and emission characteristics of a CI engine operated on vegetable oils as alternative fuels
K. Kalyani Radha, S. Naga Sarada, K. Rajagopal, E.L. Nagesh
International Journal of Automotive and Mechanical Engineering, 2011
An experimental analysis is done on four stroke single cylinder constant speed, water cooled diesel engine which is interfaced with Engine soft software. Performance and emission characteristics are evaluated for three non-edible vegetable oils viz. thumba, jojoba, neem and jojoba methyl ester to study the effect of injection pressures viz. 205, 220, 240 and 260 bar with variation in injection timing at 23°bTDC and 28°bTDC. The performance of jojoba methyl ester improved with increase in injection pressures, maximum brake thermal efficiency of 29.72% is obtained with lower emissions compared to other vegetable oils; the reason might be low viscosity and better combustion. Further investigations were carried out with new lubricant SAE 5W-30; which improved the performance of CI engine by 1.59%. All the above investigations were fruitful and these results are expected to lead to a substantial contribution to the development of a viable vegetable oil engine.
Experimental investigations in a circular tube to enhance turbulent heat transfer using mesh inserts
Journal of Engineering and Applied Sciences, 2009
Alternative fuels for a single cylinder direct injection diesel engine
K. Kalyani Radha, A. Aruna Kumari, S. Naga Sarada, E.L. Nagesh, K. Rajagopal
Proceedings 1st International Conference on Emerging Trends in Engineering and Technology Icetet 2008, 2008
This paper presents the results of investigations carried out on a single cylinder, direct injection, water cooled diesel engine operating on diesel, straight vegetable oils (Thumba oil and Neem) and 20% biodiesel blend of Thumba oil. The experiment covered a range of loads. Results show that Thumba oil can be used as an alternative fuel with better performance and lower emissions compared to Neem oil. The most significant conclusion is that 20% biodiesel blend of Thumba oil shows maximum brake power, reduced BSFC, emissions, smoke opacity and NOx than straight vegetable oils.
Investigations on low heat rejection diesel engine with carbureted methanol and crude jatropha oil as alternate fuels
SAE Technical Papers, 2007