secondary flow investigation could be regarded as an important issue in open channel flow, in spite of its lower quantity compared to the base flow in the water course. it should be given special consideration because of the influence on some hydraulic factors in open channel, specifically in compound channels. in compound channels' due to the difference in the flow velocity of the main ch...

in this paper, turbulent mixed convective heat transfer of water and al2o3 nanofluid has been numerically studied in a horizontal tube under non-uniform heat flux on the upper wall and insulation in the lower wall using mixture model. for the discretization of governing equations, the second-order upstream difference scheme and finite volume method were used. the coupling of pressure and veloci...

in this paper, the problem of turbulent forced convection flow of water- alumina nanofluid in a uniformly heated pipe has been thoroughly investigated. in numerical study, single and two-phase models have been used. in single-phase modeling of nanofluid, thermal and flow properties of nanofluid have been considered to be dependent on temperature and volume fraction. effects of volume fraction a...

the monolithic catalytic converter is still the main pollution control device for modern vehicles in order to reach the ever-increasing legislative demands for low emission standards. the catalytic converters require a large expansion from the exhaust pipe to the front face of the monolith. unfortunately, packaging constraints often do not permit the use of long diffusers. hence, flow separatio...

Experiments on the convection heat transfer and pressure drop of supercritical carbon dioxide in a mini vertical upward flow were investigated smooth tube with an inner diameter 2 mm. The experiments conducted pressures ranging from 7.62 to 8.44 MPa, mass fluxes 600 1600 kg·m?2·s?1, flux 49.3 152.3 kW·m?2. Results show that peak occurs when bulk fluid temperature is below proposed critical wall...

Objective: to investigate the efficiency of a device that generates pulsatile flow during constant-speed axial-flow pump operation for use in left ventricular assist devices. Materials and methods. The flow-generating device, hereinafter referred as «pulsator», consists variable hydraulic resistance made form hull. A tube elastic biocompatible material featuring an inner diameter 11 mm is insta...

This paper describes experimental investigations on convective heat transfer in counter flow double pipe exchanger under transverse vibration for single-phase with twisted tape insert the inner tube. Experiments were conducted inserted twist ratio from 7 to 17, amplitude 23 69 mm, frequency 20 100 Hz and Reynolds number (Re) changing 10710 21420. A maximum gain of 91% Nusselt (Nu) was obtained ...

The application prospect of a flow focusing/blurring nozzle is broad but research on gas-liquid inside the not comprehensive. mixing difficult to study by visualization experiment, so this paper proposes or gray scale level distribution experimental images. results show that increase air rate beneficial two-phase nozzle, while influence water rate, tube hole distance (the between inner and outl...