Purpose To determine the suitable kVp pair for optimal image quality of virtual monochromatic images (VMIs) and iodine quantification accuracy at low concentration, using a third generation dual-source CT (DSCT). Materials methods Multi-energy phantoms with without body rings were scanned DSCT four pairs (tube “A”/“B” voltage): 100/Sn150, 90/Sn150, 80/Sn150 70/Sn150 kVp. The reference mAs was a...

An experimental investigation has been carried out to study the turbulent flow heat transfer and to determine the pressure drop characteristics of air, flowing through a tube with insert. An insert of special geometry is used inside the tube. The test section is electrically heated, and air is allowed to flow as the working fluid through the tube by means of a blower. Air velocity, air inlet an...

Abstract This study is conducted to investigate the effect of off-center placement twisted tape on flow distribution and heat transfer in a circular tube. The width 20, 18, 16, 14 12 mm performance discussed under same twist ratio 2.0. numerical analysis field, average Nusselt number, friction factor thermo-hydraulic parameter tube are with Reynolds number ranged from 2600 8760. results indicat...

The article describes the construction of a solution for problem interaction viscoelastic aging pipe with an internal thin elastic coating and several different rigid cylindrical inserts, assuming that profiles contacting surfaces are described by rapidly changing functions. method used makes it possible to construct takes into account both rheological properties complex bodies. Using this meth...

The heat transfer characteristics of the working fluid passing through absorber a solar parabolic trough collector (SPTC) can be enhanced by creation turbulence effect. Therefore, novel idea was implemented introducing corrugated tube (CT) instead plain in collector. enhancement improved further use conical strip inserts inside SPTC. A receiver with pitch 8 mm and corrugation height 2 used thre...

PURPOSE The aim of this study was to examine if package inserts (PIs) supplied with prescribed and over-the-counter medications in Saudi Arabia contain information relevant for the safe and appropriate use of these medications. METHODS Sixty PIs for prescription-only medications (n = 37) and over-the-counter medications (n = 23) were evaluated against a set of safety criteria compiled from th...

This article examines various methods to enhance the thermal efficiency of parabolic trough solar collectors (PTCs), both theoretically and experimentally. These include increasing surface area absorber tube increase its ability absorb energy, placing a inserts inside induce turbulence hence improve heat transfer. Among other are also minimization reflection by using selective coatings on tube....