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An experimental comparison of water based alumina and silica nanofluids heat transfer in laminar flow regime

Journal of Central South University 2013年第12期20卷 3582-3588页

作者： Azari Ahmad Kalbasi Mansour derakhshandeh masoud Depertment of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic)Mahshahr Campus

Experimental investigations were carried out to determine the Al2O3/water and SiO2/water nanofluids flowing through a circular tube. convective heat transfer performance and pressure drop of Measurements show that the addition of small amounts of nano-sized Al2O3 particles to the base fluid increases heat transfer coefficients considerably, while the result for the silica nanofluids contradicts with the alumina nanofluids and this leads to some interesting results. In the case of alumina nanofluids, an average increase of 16% in convective heat transfer coefficient is observed with an average penalty of 28% in pressure drop. Moreover, flow resistance increases significantly compared to the base fluid even at very low concentrations of nanofluids. Finally, measured heat transfer coefficients are compared with predicted ones from the correlation of Shah under the same conditions.

关键词： convection forced convection heat transfer nano scale heat transfer

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An Experimental Study on Nanofluids Convective Heat Transfer Through a Straight Tube under Constant Heat Flux

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Chinese Journal of Chemical Engineering 2013年第10期21卷 1082-1088页

作者： Ahmad Azari Mansour Kalbasi masoud derakhshandeh masoud Rahimi Department of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic) MahshahrCampus Mahshahr EO. Box 415 Iran CFD-Research Center Chemical Engineering Department Razi University TagheBostan Kermanshah Iran

In this work, the laminar convective heat transfer performance and the pressure drop of water-based nanofluids containing Al2O3, TiO2 and SiO2 nanoparticles flowing through a straight circular tube were experimentally investigated. The experimental results showed that addition of small amounts of nano-sized Al2O3 and TiO2 particles to de-ionized water increased heat transfer coefficients considerably, while the SiO2 nanofluids showed the opposite behavior attracting the authors' interests. An average of 16% and 8.2% increase in heat transfer coefficient were observed with the average of 28% and 15% penalty in pressure drop for Al2O3 and TiO2 nanofluids.

关键词： convection Iorced convection heat transfer nanopartlcles nanotlulCls

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Identification of pathogenic microorganisms of repeat breeder dairy cows and a hyperimmune treatment approach

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Asian pacific Journal of Reproduction 2020年第1期9卷 44-48页

作者： Seyed Morteza Aghamiri Mohammad Rahim Ahmadi masoud Haghkhah Abdollah derakhshandeh Department of Clinical Sciences School of Veterinary MedicineShahid Bahonar University of KermanKermanIran Department of Clinical Sciences School of Veterinary MedicineShiraz UniversityShirazIran Department of Pathobiology School of Veterinary MedicineShiraz UniversityShirazIran

Objective:To investigate the bacterial infections in repeat breeder dairy cows and to evaluate the treatment effects of hyperimmune serum against two main endometritis bacteria,Escherichia(E.)coli and Trueperella ***:A total of 29 Holstein multiparous cows with three or more unsuccessful artificial inseminations were carried out and examined to confirm the absence of reproductive tract abnormality and vaginal *** lavage was performed to collect uterine samples for bacterial and fungal *** addition,polymerase chain reaction(PCR)was done to detect Trueperella pyogenes,***,Fusobacterium necrophorum,and Prevotella *** cytological study was done on cervical *** hyperimmune serums produced against Trueperella pyogenes and *** were infused into the uterus of repeat breeder cows and two doses of prostaglandin F2αwere administrated intramuscularly within 14 days'***:There were 10 positive samples in the bacterial culture with 19 isolations and no growth of the main causative bacteria of *** the PCR method,no Trueperella pyogenes,Fusobacterium necrophorum,and Prevotella melaninogenicus were ***,11 positive samples of *** were identified by *** was detected in one case of repeat breeder *** median(interquartile range)of neutrophils in vaginal discharge was 12(22.5).Eighteen from twenty-nine(62.1%)repeat breeder and eight from eleven(72%)cows with *** infections in PCR were made pregnant in the first artificial insemination after treatment by intrauterine infusion of hyperimmune serum and prostaglandin F2α.Conclusions:Intrauterine administration of hyperimmune serum could be an alternative to antibiotics for the treatment of repeat breeder cows.

关键词： Cow Repeat breeder Bacterial and fungal culture Polymerase chain reaction Hyperimmune serum

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