In current numerical study

forced flow and heat transfer of water/NDG (Nitrogen-doped graphene) nanofluid in nanoparticles mass fractions (

φ

) of 0

2% and 4% at Reynolds numbers (

Re

) of 10

50

100 and 150 are simulated in steady states. Studied geometry is a two-dimensional microchannel under the influence of nanofluid jet injection. Temperature of inlet fluid equals with

T

c

=293 K and hot source of microchannel is under the influence of oscillating heat flux. Also

in this research

the effect of the variations of attack angle of triangular rib (15°

30°

45° and 60°) on laminar nanofluid flow behavior inside the studied rectangular geometry with the ratio of

L

/

H

=28 and nanofluid jet injection is investigated. Obtained results indicate that the increase of Reynolds number

nanoparticles mass fraction and attack angle of rib leads to the increase of pressure drop. By increasing fluid viscosity

momentum depreciation of fluid in collusion with microchannel surfaces enhances. Also

the increase of attack angle of rib at higher Reynolds numbers has a great effect on this coefficient. At low Reynolds numbers

due to

slow motion of fluid

variations of attack angle of rib

especially in angles of 30°

45° and 60° are almost similar. By increasing fluid velocity

the effect of the variations of attack angle on pressure drop becomes significant and pressure drop figures act differently. In general

by using heat transfer enhancement methods in studied geometry

heat transfer increases almost 25%.