A nanofluid is mixture of nano sized particles and a base fluid. This paper investigates by using laboratory based double pipe heat exchanger model, the performance of nanofluid containing about 48.46nm  particle size nanoparticles (ZnO) without or with addition of nonionic surfactant Rokanol K7 (500ppm) into the base fluid double distilled water to prepared three different concentrations 1.0%,...

In this study, the convective heat transfer and pressure drop in laminar flow of Al2O3/water and CuO/water nanofluids through square and triangular cross-sectional ducts have been numerically investigated using new technique. It has been assumed that there is constant heat flux boundary condition at walls. In addition, to include the presence of nanoparticles, the dispersion model has been used...

Effect of fractional gas hold-up εG on volumetric mass transfer coefficient KLa were studied for two different type of airlift contactors conventional and modified. KLa was directly proportional to gas hold-up within bubbly flow regime (UG < 0.075 m/s ) in conventional one but reverse trend ( inversely proportional) was reported in modified airlift contactor. Mathematical relation between KLa a...

A bubble column was used to study the heat effect on CO2 absorption in methydiethanolamine solutions and on volumetric mass transfer coefficient. It was found that the temperature varied until 4 oC between the beginning and the end of the process. Our studies provide an empirical correlation type Boltzmann to estimate the temperature at different amine concentration (0-1M) and gas flow rate (10...

Abstract This review article covers the topics of evaluation and experimental determination oxygen mass transfer coefficients ( k L a ) for their application in characterising bioreactors fermentations processes. The provides comparison different approaches determining bioreactors. Additionally, influence bioreactor design fermentation parameters on is discussed. aim to provide useful informati...

The oxygen transfer rate (OTR) of dioxygen to solutions describing the transport gas from gaseous phase into liquid a reaction system over given period is an important measure for biotechnological applications. OTRs have already been described aqueous systems and also recently organic non-conventional media, whereas novel class solvents, deep eutectic solvents (DESs), not determined yet. In thi...

The oxygen carrying performance of a perfluorooctyl bromide (PFOB) emulsion is considered. The intended purpose is to enhance hepatocyte growth and function in a bio-artificial liver support system (BALSS). Such oxygen carrying emulsions have previously been used in biological systems (e.g. cell culturing). However, optimum emulsion characteristics for enhanced oxygen mass transfer have not bee...

The results of complex studies the quantitative relationship between stage-by-stage mass transfer O2 and efficiency cardiorespiratory system functioning in relation to its consumption adolescents’ body under conditions relative rest are presented.&#x0D; obtained show that adolescents, modes nature respiratory circulatory systems have a number age-related differences compared with adult men. So,...

The optimal shape of a two dimensional turbulator above an isothermal flat plate is found by using numerical simulation. The turbulent boundary layer over the flat plate was disrupted at various situations by inserting a quadrilateral bar where the boundary layer thickness kept more than three times greater than the insert\'s height. As a result, the overall heat transfer coefficient of the wal...