laminar mixed convection of aluminium oxide (al2o3)–water nanofluid flow in an inclined annulus using a single-phase approach was numerically studied. constant heat flux boundary conditions were applied on the inner and outer walls. all the thermophysical properties of nanofluid, such as, viscosity, heat capacity, thermal conductivity, and thermal expansion coefficient, except density in the bo...

in this paper, convection heat transfer of al2o3-water nanofluid turbulent flow through internally ribbed tubes with different rib shapes (rectangular, trapezoidal and semi-circular) is numerically investigated. for each rib shape, the optimum geometric ratio and volume fraction were calculated using entropy generation minimization technique. the governing equations in steady state and axisymme...

Numerical investigation on the generality of nanoparticle velocity equation had been done on the previous published work. The three dimensional governing equations (continuity, momentum and energy) were solved using finite volume method (FVM). Parametric study of thermal performance between pure water-cooled and nanofluid-cooled are evaluated for volume fraction in the range of 1% to 4%, and na...

The objective of the present study is the synthesis of MWCNT-TiO2 hybrid nanostructures by solvothermal synthesis method with TiCl4 as precursor. The heat transfer enhancement due to the use of MWCNT-TiO2 nanofluid was investigated. As-prepared hybrid materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that MWCNTs were uniformly dec...

Abstract The key objective of the present research is to examine hybrid magnetohydrodynamics (MHD) nanofluid (Carbon-nanotubes and ferrous oxide–water) CNT – Fe 3 O 4 / H 2 flow into a horizontal parallel channel with thermal radiation through squeezing dilating porous walls. parting motion triggered by walls channel. fluid time-dependent laminar. asymmetric upper lower are distinct in temperat...

This study explores the issue of micropolar fluids and heat transfer in a hybrid nanofluid through moving thin needle with prescribed surface flux. Here, SWCNT MWCNT are referred to as nanoparticles, Engine oil Refrigerant-134A working fluid. Similarity transformation is implemented acquire similarity equations, then numerically solved by utilizing shooting technique bvp4c function. Hybrid nano...

Abstract This study proposes a novel technology to enhance heat transfer by combining nanofluid and helical grooved tubes. The researchers used two-step method obtain stable modified CuO nanofluid. They then constructed an experimental setup investigate the single-phase of in tube, compared its performance traditional methods under varying volume fractions Reynolds numbers. results indicate tha...

This article reports a recent study on the application of a two-phase closed thermosyphon (TPCT) in a thermosyphon for economizer (TPEC). The TPEC had three sections of equal size; the evaporator, the adiabatic section, and the condenser, of 250 mm × 250 mm × 250 mm (W × L × H). The TPCT was a steel tube of 12.7-mm ID. The filling ratios chosen to study were 30, 50, and 80% with respect to the ...