A B S T R A C TThis manuscript investigates the bending vibration dynamic of a single walled carbon nanotube (SWCNT) based on the theory of non-local elasticity. Fundamental natural frequencies and mode shapes of the SWCNT are computed by using a semi-analytical procedure called differential quadrature method (DQM), which gives accurate results in reference with the exact solution.
This paper presents a numerical study of laminar forced convective flow of nanofluid-based water/Al2O3 in a two-dimensional horizontal microchannel heat sink. The governing equations are solved by using the finite volume method based on simple algorithm. The effect of solid nanoparticles on the heat transfer is investigated after comparing our results with experimental data. The founding results showed that the use of nanofluid has enhanced the heat transfer in comparison with pure fluid, and the increasing of Al2O3 concentration enhances the thermal and dynamic parameters. Nusselt number and friction coefficient have been enhanced with the increasing of Reynolds number. This work contributes to ameliorate the cooling systems by integrating the nanofluids in the next generation of microchannels heat sinks.
This paper aims to study numerically
the laminar convective heat transfer of ionized water flow inside rectangular
heat sinks with periodic expansion-constriction cross-section; each heat sink
consists of parallel microchannels system with 4 mm wide and 0.1 mm deep in
constant cross-section segment.
Two-dimensional laminar numerical simulations, based on Navier-Stoks
equations and energy equation, are obtained under the same boundary conditions
for different microchannels. In this study, the heat transfer and pressure drop
inside microchannels with cross-section (cylindrical grooves and triangular
cavities) are compared with that of simple smooth microchannel at Reynolds
number ranging from 150-1500; an increase in pressure drop of 44% for all
microchannels is observed with Reynolds
number increasing. The obtained results
indicate an enhancement in Nusselt number for all microchannels at all Reynolds
number values with a maximum enhancement of 36%, these ameliorated thermal
parameters attribute to enhance the heat transfer efficiency of proposed
microchannels. Which improve the effect of periodic expansion-constriction
cross-section on the heat transfer performance for microelectromechanical
systems (MEMS) cooling phenomena.
Carbon nanotubes (CNT's) has revolutionized the world of nanotechnology by their exceptional proprieties, which make them the core of many applications in several fields, many studies has been done to investigate their mechanical proprieties since their discovery. In this paper, the free vibration of a single walled carbon nanotube is studied in an elastic environment based on the theory of non-local elasticity and discretized by differential quadrature method (DQM); the effect of the surrounding medium on fundamental frequencies is discussed.
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