A three dimensional, compressible, steady, one phase flow of reactant-product mixture in the air side electrode of proton exchange membrane fuel cell (PEMFC) is numerically studied in this paper. The mixture is composed of three species: oxygen, nitrogen and water vapor. The performance of the cell is enhanced by partial blockage of the flow field channels. Various types of these blocks also ca...

In the present investigation, slip-continuum and molecular (DSMC) flow models have been used to compare the drag coefficient on a confined microsphere over a range of Knudsen numbers between 0.01 and 0.4. The simulations consider a fixed Reynolds number (Re=0.125) and a range of blockage ratios from 2.0 up to 13.0. Two separate problem formulations have been studied; the first considers flow pa...

Asphaltene precipitation and deposition is a serious problem in many Iranian fields. The deposited asphaltene results in partial or total blockage of the wellbore and wellstring reducing or completely seizing oil production. This paper studies the asphaltene problem and mitigation methods in wellstring systematically. It presents new approach based on the combination of thermodynam...

ABSTRACT It is very important for the safe production of sand producing oil and gas wells to make clear erosion law control screen pipe. The experiment metal mesh under two working conditions blockage non-blockage was carried out with jet experimental device. influencing factor solid mass fraction (0.3%, 0.5%, 0.8%), aperture velocity (1.5 m/s, 4 6 m/s) particle size (20 μm, 54 74 μm) on rate a...

When a hydrokinetic turbine operates in confined flow, blockage effects are introduced, altering the flow at and downstream of rotor. Blockage have significant effect on loading performance turbines. As result, understanding them is critical for design prediction. The current study examines main interaction solidity (σ), tip speed ratio (TSR), (ε), pitch angle (θ) how influences (CP) three-blad...

Proapoptotic phosphorothioate oligonucleotides such as G3139 (an 18-mer) induce Bcl-2-independent apoptosis, perhaps partly via direct interaction with VDAC and reduction of metabolite flow across the mitochondrial outer membrane. Here, we analyzed the interactions at the molecular level. Ten micromolar G3139 induces rapid flickering of the VDAC conductance and, occasionally, a complete conduct...