A two fluid model (TFM) was used to study gas-solid heat transfer in a riser with different inclination angles. A two dimensional pipe with 5.8 cm internal diameter and 5 meter length was chosen.  Effect of bed angle and solid particles feed rate were studied on the heat transfer behavior of gas and solid particles. Obtained results from simulation are compared with the experimental data in the...

the direct sulfation of three high purity iranian limestones and one precipitated calcium carbonate from different sources, containing more than 97 % caco3, were studied in a specially designed fixed bed reactor under atmospheric pressure, in the presence of excess co2 to prevent decomposition of caco3. experiments were carried out over a range of particle sizes from 1.6-2.5  mm at four tempera...

background and objectives: the addition of plasticizers (mainly phthalates and adipates) makes plastic flexible and popular for packaging, storing and preserving food, water, and so on. the most widely used plasticizer in food contact applications is di-ethylhexyl phthalate (dehp) though being suspected to have carcinogenic and estrogenic properties. the aim of this study is application of magn...

carbon disulfide is used predominantly in the manufacture. it has affects the nervous system. in this study, the applicability of spme as a passive sampler for determination of carbon disulphide in air was studied. effect of sampler and environmental parameters on uptake of carbon disulphide was studied as well. four fibers were tested to select the best sampler for determine carbon disulfide i...

The effect of noble gas cluster species on the interaction with solid surfaces was investigated. Processes Ar, Kr and Xe clusters Cu Mo were studied using molecular dynamics simulations. It is shown that lighter front atoms undergo more backscattering from surface atoms, causing intense multiple collisions between atoms. This affects penetration, energy exchange thermalization. influence per at...

We give a strong evidence that noncrystalline materials such as quasicrystals or incommensurate solids are not exceptions but rather are generic in some regions of a phase space. We show this by constructing classical lattice gas models with translationinvariant, finite-range interactions and with a unique quasiperiodic ground state which is stable against small perturbations of two-body potent...

We propose a mechanism of long-range coherent coupling between nuclear spins which can be used as qubits in solid-state semiconductor-heterojunction quantum information processing devices. The coupling is via localized donor electrons which in turn interact with the two-dimensional electron gas. An effective two-spin interaction Hamiltonian is derived and the coupling strength is evaluated. We ...

We study the migration of solid bodies in turbulent protoplanetary accretion discs by means of global MHD simulations. The bodies range in size from 5 centimetres up to 1 metre, and so include objects whose migration is expected to be the most rapid due to gas drag interaction with the disc. As they drift inward through the disc, some of them are trapped in regions where gas pressure maxima are...