DESPI TE TWO DECADES OF IN TENSE RESEARCH , high temperature superconductors still hold many mysteries. Although they share some properties with their well-understood “conventional” low-temperature cousins, in particular the ability to carry current without any resistance, the differences are plentiful. The most obvious difference is the transition temperature TC, below which superconductivity ...

This study aims to better characterize the heat transfer and flow structure in fully developed nucleate boiling regime a semi-annular duct. Experiments with refrigerant HFE7000 were performed range of Reynolds numbers from 13 000 40 500, subcoolings close 15 ?C, for constant heating power, wall temperature rates (linear increase temperature). With flux is well predicted by Chen-type correlation...

Introduction The film boiling reactor (FIBOR) is analyzed to show the influence of radiation across the vapor film on product yields. The geometry is that of a horizontal, catalyst-coated, tube suspended in a pool of saturated methanol at atmospheric pressure. The vapor film surrounding the heated tube is the reacting volume and surface reactions are treated with an Arrhenius form of the reacti...

a method for predicting liquid densities of binary mixtures from heat of vaporization and liquid densityat boiling point temperature (δhvap and n b ρ ) as scaling constants, is presented. b2(t) follows a promisingcorresponding-states principle. calculation of α(t) and b(t), the two other temperature-dependentconstants of the equation of state, are made possible by scaling. as a result δhvap and...

BACKGROUND This study investigates the generation of HCl and other acid gases from boiling calcium chloride dominated waters at atmospheric pressure, primarily using numerical modeling. The main focus of this investigation relates to the long-term geologic disposal of nuclear waste at Yucca Mountain, Nevada, where pore waters around waste-emplacement tunnels are expected to undergo boiling and ...

Narrow temperature range distillates from biologically active solvent refined coal-l and -II heavy-end coal liquids were fraction ated according to chemical class and assayed for initiation of skin carcinogenesis in CD-1 mice. In addition, instrumental chem ical analyses were performed on the distillates and their chemical fractions. Results showed that initiation activity in these complex fuel...

The thermo-responsive properties of borinic acid polymers were investigated by experimental and molecular dynamics simulation studies. The homopolymer poly(styrylphenyl(tri-iso-propylphenyl)borinic acid) (PBA) exhibits an upper critical solution temperature (UCST) in polar organic solvents that is tunable over a wide temperature range by addition of small amounts of H2O. The UCST of a 1 mg mL(-...

A bench work study was carried out to investigate the use of kaolinitic clay containing 29.4% Al2O3 extremely abundant in Saudi Arabia for the production of pure alumina by calcination at 700 o C for 1h (recommended by previous investigators) then leached by hydrochloric acid. The effects of leaching temperature (25 o C to boiling temperature), period of activation (10-150 minutes), acid concen...

A new cooling scheme is proposed where the primary working fluid flowing through a micro-channel heat sink is pre-cooled to low temperature using an indirect refrigeration cooling system. Cooling performance was explored using HFE 7100 as working fluid and four different micro-channel sizes. High-speed video imaging was employed to help explain the complex interrelated influences of hydraulic d...