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Turbulent Heat Transfer and Pressure Drop in Tube Fitted with Square-cut Twisted Tape

Chinese Journal of Chemical Engineering 2010年第4期18卷 609-617页

作者： P.Murugesan k.mayilsamy S.Suresh Department of Mechanical Engineering K.S.Rangasamy College of TechnologyTiruchengode-637215India Department of Mechanical Engineering Institute of Road and Transport TechnologyErode-638316India Department of Mechanical Engineering National Institute of TechnologyTiruchirappalli-620015India

Heat transfer,friction factor and thermal enhancement factor characteristics of a double pipe heat exchanger fitted with square-cut twisted tapes（STT） and plain twisted tapes（PTT） are investigated experimentally using the water as working *** tapes（STT and PTT） have three twist ratios（y=2.0,4.4 and 6.0） and the Reynolds number ranges from 2000 to *** experimental results reveal that heat transfer rate,friction factor and thermal enhancement factor in the tube equipped with STT are significantly higher than those fitted with PTT. The additional disturbance and secondary flow in the vicinity of the tube wall generated by STT are higher compared to that induced by the PTT is referred as the reason for better *** the range considered,the Nusselt number,friction factor and thermal enhancement factor in a tube with STT are respectively,1.03 to 1.14,1.05 to 1.25 and 1.02 to 1.06 times of those in tube with *** empirical correlation is also formulated to match with experimental data of Nusselt number and friction factor for STT and PTT.

关键词： heat transfer enhancement friction factor plain twisted tape square-cut twisted tape secondary flow

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Heat Transfer and Friction Factor Studies in a Circular Tube Fitted with Twisted Tape Consisting of Wire-nails

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Chinese Journal of Chemical Engineering 2010年第6期18卷 1038-1042页

作者： P. Murugesan k. mayilsamy S. Suresh Department of Mechanical Engineering K.S. Rangasamy College of Technology Tiruchengode-637215 India Deoartment of Mechanical Enzineerin~ Institute of Road and Transport Technology Erode-638316 India Departrnent of Mechanical Engineering National Institute of Technology Tiruchirappalli-620015 India

This paper deals with the experimental investigation on Nusselt number,friction factor and thermal en-hancement factor of a double pipe heat exchanger equipped with twisted tape consisting wire nails(WN-TT) and plain twisted tapes(P-TT) with three different twist ratios of y 2.0,4.4 and 6.0. Test runs are conducted using the water as the working fluid with Reynolds number range between 2000 and 12000 for WN-TT and P-TT. It is found that Nusselt number,friction factor and thermal enhancement factor in the tube equipped with WN-TT appreciably higher than those in the tube fitted with P-TT and plain tube. Over the range considered Nusselt number,friction factor and thermal enhancement factor in a tube with WN-TT are respectively,1.08 to 1.31,1.1 to 1.75 and 1.05 to 1.13 times of those in tube with P-TT. The better performance of WN-TT is due to combined effects of the follow-ing factors:(1) common swirling flow generated by P-TT,(2) additional turbulence offered by the wire nails. Em-pirical correlations for Nusselt number,friction factor and thermal enhancement factor are also formulated from the experimental results of WN-TT and P-TT.

关键词： heat transfer enhancement friction factor plain twisted tape turbulence swirl flow

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COVID-19 neurotropism and implications for therapy

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Neuroimmunology and Neuroinflammation 2020年第2期7卷 141-149页

作者： Mahasweta Das Courtney Penn Taylor Martinez karthick.mayilsamy Andrew McGill Alison Wiling Shyam S.Mohapatra Subhra Mohapatra Department of Molecular Medicine University of South FloridaMorsani College of MedicineTampaFL 33612USA Department of Internal Medicine University of South FloridaMorsani College of MedicineTampaFL 33612USA Department of Neurosurgery and Brain Repair Center of Excellence for aging and Brain RepairUniversity of South FloridaMorsani College of MedicineTampaFL 33612USA James A Haley Veterans Hospital TampaFL 33612USA

The mechanism underlying the pathogenesis of severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)infection in humans is poorly understood,although the cellular receptors which facilitate the virus fusion have been *** the major symptoms of the infection have been identified as acute respiratory distress,pneumonia,and fever,recently,symptoms involving nervous system dysfunctions,including encephalopathy and stroke,have been ***,we comprehensively review the evidence that SARS-CoV-2 infection involves a neurotropic mechanism including a nose-brain-lung axis suggesting implications in therapy development.

关键词： SARS-CoV-2 nose-brain-lung axis neurotropism

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