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RISS 인기검색어
- 검색키워드
- 저자 : Anil Kumar Bhowmick (검색결과 2 건)
- 무료
- 기관 내 무료
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Thermal performance of functionally graded parabolic annular fins having constant weight
Vivek Kumar Gaba,Anil Kumar Tiwari,Shubhankar Bhowmick 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
The proposed work reports the performance of parabolic annular fins of constant weight made of functionally graded materials. Thework involves computation of temperature gradient, efficiency and effectiveness of such fins and compares the performances for differentfunctionally graded parabolic fin profiles obtained by varying grading parameters and profile parameters respectively keeping theweight of the fins constant. The functional grading of thermal conductivity is based on a power function of radial co-ordinate which consistsof parameters, namely grading parameters, varying which different grading combinations are studied. A general second order ordinarydifferential equation has been derived for all the profiles and material grading. The efficiency and effectiveness of the annular fins ofdifferent profile and grading combinations have been calculated and plotted and the results reveal the dependence of fin performance onprofile and grading parameter.
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Green synthesis of fluorescent carbon nanoparticles from Lychee (Litchi chinensis) plant
Vidhi Chaudhary,Anil Kumar Bhowmick 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
Fluorescent carbon nanoparticles (CNPs) were prepared from waste lychee peel by hydrothermal process using green chemistry. These CNPs were characterized by UV-vis absorption, fluorescence spectroscopy, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. Their morphology was analyzed by field emission scanning electron microscopy. Spherical carbon nanoparticles with a particle size ranging from 40-70 nm were observed. FTIR data indicated that these CNPs were functionalized with hydroxyl and carboxylic or carbonyl group. The maximum fluorescence intensity for these CNPs was observed on the excitation wavelength at 365 nm with emission maxima centered at 450 nm. These particles exhibited excitation wavelength dependent fluorescence emission spectra. CNPs were found to be highly fluorescent and exhibited high water solubility. The band gap was estimated to be 3.8 eV. Therefore, as prepared CNPs would be useful in bioimaging, biolabeling and in the other applications of nanobiotechnology.
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