Dorin Lelea - Academia.edu (original) (raw)
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Visvesvaraya Technological University
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Papers by Dorin Lelea
Heat and Mass Transfer, 2010
Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flo... more Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flow in a branching network, a phenomenon that might be found for example in the human bronchi. As the first approximation, the working fluid was water with laminar flow regime. ...
International Communications in Heat and Mass Transfer, 2014
The paper presents the numerical analysis on microchannel laminar heat transfer and fluid flow of... more The paper presents the numerical analysis on microchannel laminar heat transfer and fluid flow of nanofluids in order to evaluate the suitable thermal conductivity of the nanoparticles that results in superior thermal performances compared to the base fluid. The diameter ratio of the micro-tube was D i /D o = 0.3/0.5 mm with a tube length L = 100 mm in order to avoid the heat dissipation effect. The heat transfer rate was fixed to Q = 2 W. The water based Al 2 O 3 , TiO 2 and Cu nanofluids were considered with various volume concentrations ϕ = 1,3 and 5% and two diameters of the particles d p = 13 nm and 36 nm. The analysis is based on a fixed Re and pumping power Π, in terms of average heat transfer coefficient and maximum temperature of the substrate. The results reveal that only the nanofluids with particles having very high thermal conductivity (λ Cu = 401 W/m K) are justified for using in microcooling systems. Moreover, the analysis is sensitive to both the comparison criteria (Re or Π) and heat transfer parameters (h ave or t max ).
International Journal of Heat and Mass Transfer, 2014
and sharing with colleagues.
International Journal of Heat and Mass Transfer, 2004
The experimental and numerical research on microchannel heat transfer and fluid flow was presente... more The experimental and numerical research on microchannel heat transfer and fluid flow was presented in the paper. Diameters of the microtubes were 0.1, 0.3 and 0.5 mm and the flow regime was laminar with Re-number range up to 800. The working fluid was distilled water and the tube material was stainless steel. The experimental setup was designed in such a way that the investigation of the average friction factor and developing heat transfer was possible. Due to the large scattering in the reported experimental results, the scope of this research was to make the accurate measurements and to compare the experimental heat transfer and fluid flow characteristics with numerical and theoretical results for the conventional tubes.
International Communications in Heat and Mass Transfer, 2011
ABSTRACT
International Communications in Heat and Mass Transfer, 2010
ABSTRACT
Heat and Mass Transfer, 2011
... viscosity and thermal conductivity, through microchannels and micropipes, under isoflux wall ... more ... viscosity and thermal conductivity, through microchannels and micropipes, under isoflux wall bound ... cous dissipation and rarefaction on rectangular micro-channel convective heat transfer rates, subject ... work, and axial conduction are all significant within the slip flow regime for ...
Heat and Mass Transfer, 2010
Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flo... more Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flow in a branching network, a phenomenon that might be found for example in the human bronchi. As the first approximation, the working fluid was water with laminar flow regime. ...
Heat and Mass Transfer, 2010
Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flo... more Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flow in a branching network, a phenomenon that might be found for example in the human bronchi. As the first approximation, the working fluid was water with laminar flow regime. ...
International Communications in Heat and Mass Transfer, 2014
The paper presents the numerical analysis on microchannel laminar heat transfer and fluid flow of... more The paper presents the numerical analysis on microchannel laminar heat transfer and fluid flow of nanofluids in order to evaluate the suitable thermal conductivity of the nanoparticles that results in superior thermal performances compared to the base fluid. The diameter ratio of the micro-tube was D i /D o = 0.3/0.5 mm with a tube length L = 100 mm in order to avoid the heat dissipation effect. The heat transfer rate was fixed to Q = 2 W. The water based Al 2 O 3 , TiO 2 and Cu nanofluids were considered with various volume concentrations ϕ = 1,3 and 5% and two diameters of the particles d p = 13 nm and 36 nm. The analysis is based on a fixed Re and pumping power Π, in terms of average heat transfer coefficient and maximum temperature of the substrate. The results reveal that only the nanofluids with particles having very high thermal conductivity (λ Cu = 401 W/m K) are justified for using in microcooling systems. Moreover, the analysis is sensitive to both the comparison criteria (Re or Π) and heat transfer parameters (h ave or t max ).
International Journal of Heat and Mass Transfer, 2014
and sharing with colleagues.
International Journal of Heat and Mass Transfer, 2004
The experimental and numerical research on microchannel heat transfer and fluid flow was presente... more The experimental and numerical research on microchannel heat transfer and fluid flow was presented in the paper. Diameters of the microtubes were 0.1, 0.3 and 0.5 mm and the flow regime was laminar with Re-number range up to 800. The working fluid was distilled water and the tube material was stainless steel. The experimental setup was designed in such a way that the investigation of the average friction factor and developing heat transfer was possible. Due to the large scattering in the reported experimental results, the scope of this research was to make the accurate measurements and to compare the experimental heat transfer and fluid flow characteristics with numerical and theoretical results for the conventional tubes.
International Communications in Heat and Mass Transfer, 2011
ABSTRACT
International Communications in Heat and Mass Transfer, 2010
ABSTRACT
Heat and Mass Transfer, 2011
... viscosity and thermal conductivity, through microchannels and micropipes, under isoflux wall ... more ... viscosity and thermal conductivity, through microchannels and micropipes, under isoflux wall bound ... cous dissipation and rarefaction on rectangular micro-channel convective heat transfer rates, subject ... work, and axial conduction are all significant within the slip flow regime for ...
Heat and Mass Transfer, 2010
Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flo... more Abstract The paper deals with the three dimensional numerical simulation of the reciprocating flow in a branching network, a phenomenon that might be found for example in the human bronchi. As the first approximation, the working fluid was water with laminar flow regime. ...