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35 results on '"Bhalla, Vishal"'

14. Numerical Simulation of Hybrid Passive Heat Sink for On-Board EV Charger.

Author

Gole, Pranali, Sable, Mahendra, and Bhalla, Vishal

Subjects
COMPUTER simulation, HEAT sinks, PLUG-in hybrid electric vehicles, BATTERY chargers, STABILITY (Mechanics)
Abstract

The Battery chargers are an important component in electric and plug-in hybrid vehicles and various other clean energy systems. The thermal management in the battery charger is a crucial aspect that influences its overall performance and cyclic stability. Passive cooling technology using heat sinks is preferred in developing battery chargers due to its reliability, quietness, and efficiency. In the present work, new hybrid passive heat sinks with various fin geometries namely inclined interrupted fins, pin fins, and straight interrupted fins, have been developed by adding a phase change material layer to passively cooled bare fin heat sinks. The developed heat sinks have the same geometric footprint as that of the battery charger; IC650 was built by the industrial partner of the project Delta-Q Technologies. Simulations were carried out to analyze the effects of PCM quantities for thermal loads on the heating-cooling performance of the HPHS using Ansys fluent 19.1 commercially available software to validate the experimental results from the literature study. Inclined interrupted fin design found more effective in terms of thermal performance among all considered configurations. [ABSTRACT FROM AUTHOR]

Published
2022

25. De Garengeot hernia: a case study and literature review

Author

Bhalla, Ashish and Bhalla, Vishal

Subjects
Appendicitis -- Diagnosis, Appendicitis -- Care and treatment, Appendicitis -- Case studies, Hernia -- Case studies, Hernia -- Care and treatment, Health
Abstract

Table of Contents Abstract Case Report Discussion Conclusion References Abstract De Garengeot hernias are extremely rare. We present a case of a 73-year-old gentleman who presented acutely with an incarcerated [...]

Published
2007

26. Incarcerated spigelian hernia: an unusual cause of acute right iliac fossa pain: a case study and literature review

Author

Bhalla, Ashish, Amin, Hemisha, Parvathareddy, Devi, and Bhalla, Vishal

Subjects
Arthralgia -- Diagnosis, Arthralgia -- Complications and side effects, Arthralgia -- Case studies, Hernia -- Risk factors, Hernia -- Diagnosis, Hernia -- Care and treatment, Hernia -- Case studies, Laparoscopic surgery -- Methods, Health
Abstract

Table of Contents Abstract Case Report Discussion Conclusion References Abstract Spigelian Hernias are rare. We present a case of a 57 year old gentleman who presented acutely with an incarcerated [...]

Published
2007

35. Potential Heat Transfer Fluids (Nanofluids) for Direct Volumetric Absorption-Based Solar Thermal Systems

Author

Khullar, Vikrant, Bhalla, Vishal, and Tyagi, Himanshu

Abstract

Nanoparticle dispersions or more popularly “nanofluids” have been extensively researched for their candidature as working fluid in direct-volumetric-absorption solar thermal systems. Flexibility in carving out desired thermophysical and optical properties has lend the nanofluids to be engineered for solar thermal and photovoltaic applications. The key feature which delineates nanofluid-based direct absorption volumetric systems from their surface absorption counterparts is that here the working fluid actively (directly) interacts with the solar irradiation and hence enhances the overall heat transfer of the system. In this work, a host of nanoparticle materials have been evaluated for their solar-weighted absorptivity and heat transfer enhancements relative to the basefluid. It has been found that solar-weighted absorptivity is the key feature that makes nanoparticle dispersions suitable for solar thermal applications (maximum enhancement being for the case of amorphous carbon nanoparticles). Subsequently, thermal conductivity measurements reveal that enhancements on the order of 1–5% could only be achieved through addition of nanoparticles into the basefluid. Furthermore, dynamic light scattering (DLS) and optical measurements (carried out for as prepared, 5 h old and 24 h old samples) reveal that nanoclustering and hence soft agglomeration does happen but it does not have significant impact on optical properties of the nanoparticles. Finally, as a proof-of-concept experiment, a parabolic trough collector employing the amorphous carbon-based nanofluid and distilled water has been tested under the sun. These experiments have been carried out at no flow condition so that appreciable temperatures could be reached in less time. It was found that for the same exposure time, increase in the temperature of amorphous carbon based nanofluid is approximately three times higher as compared to that in the case of distilled water.

Published
2018
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