Heat transport through a corroded carbon steel pipe in a double pipe heat exchanger in which aerated 0.1 N NaCl solution flowing in the annular space has been investigated.
Drag-reduction by the use of minor amount of polymeric additives is by far the most technique to reduce the frictional resistance and to save pumping power for turbulent pipe flow. In the present work, the turbulent drag-reduction effectiveness of polyisobutylene, type oppanol B 250 was studied in a build-up closed loop circulation system at different flowing conditions.The turbulent mode was produced via a positive displacement pump to avoid any shear degradation of polymer chains during the pumping stage.
The prediction of molar volume of saturated vapor can be calculated from many equations of state, some of these equations applied for both gas and liquid phase ,and some of them applied for gas phase only .
Turbulent drag-reduction efficiency of polyisobutylene with three different, very high molecular weights was studied in a build-up closed loop gas oil circulation system. The turbulent mode was produced via a positive displacement gear pump to avoid mechanical degradation of polymer chains during the experimental period. Three molecular weights 2.9*106 ,5.9*106 g/mol dissolved in reformate were used as additives in order to investigate the effect of molecular weight on drag-reduction rate and flow capacity increase.
Throughput increase by drag-reducing additives offers a suitable quick solution to meet increased demand by pipelining of oil or water which arises either permanently or seasonally. This has placed increased emphasis upon studies directed towards preparing efficient solutions of drag- reducer additives. Commercially available polyisobutylenes (Oppanol B types) of three different high molecular weights in addition to water soluble carboxymethylcellouse were chosen for the investigation.
The aim of this research is to study the effect of rheological properties ,concentrations of non-Newtonian fluids, particle shape, size and the density difference between particle and fluid on drag coefficient (C) and settling velocity (VS), also this study show the effect drag coefficient (C)and Reynolds' number (Re) relationship and the effect of rheological properties on this relationship.P An experimental apparatus was designed and built, which consists of Perspex pipe of length of 160 cm. and inside diameter of 7.8 cm.
The present study was focusing on the effect of seminal fluid infection on sperm functions and fertilizing capacity of mouse spermatozoa. Two kinds of bacteria were isolated from seminal fluid of 14 infertile patients (23-51 years) during their attendance at the Institute of Embryo Research and Infertility Treatment involves Staphylococcus aureus (Staph. aureus) and Escherichia coli (E. coli), which were identified by biochemical tests and API systems.
Vapor-Liquid-Liquid Equilibrium (VLLE) systems are complicated systems; they involve both a two phase liquid and a two phase vapor.Obtaining equilibrium data on these systems is very difficult, Vapor-LiquidEquilibrium (VLE) recirculation stills can not be used to obtain accurate VLLE data due to incorrect composition of the recycled condensed vapor to the boiler, modifications are made to these stills to obtain accurate equilibrium data for partial and immiscible liquid systems.Another difficulty when collecting the vapor & liquid samples, a modification
Prediction of accurate values of enthalpy (H) or enthalpy departure (H ) for gases is very important in process design calculations and other industrial applications.Experimental measurements of enthalpy or enthalpy departure for superheated vapor are not easy to perform.
Abundant data on the momentum, heat and mass transfer is available in the literature. Most of this data is confined to impermeable surfaces. It is known from studies concerning flat plates that blowing into the boundary layer can severely reduce the transport coefficients (friction factor,mass and heat transfer coefficients). This work studies the influence of blowing on the friction factor and mass transfer