We present general relativistic magnetohydrodynamic (GRMHD) numerical simulations of the accretion flow around the supermassive black hole in the Galactic centre, Sagittarius A* (Sgr A∗). The simulations include for the first time radiative cooling processes (synchrotron, bremsstrahlung, and inverse Compton) selfconsistently in the dynamics, allowing us to test the common simplification of igno...

Micro/nano geometries with specified wall heat flux are widely encountered in electronic cooling and micro/nano-fluidic sensors. We introduce a new technique to impose the desired (positive/negative) wall heat flux boundary condition in the DSMC simulations. This technique is based on an iterative progress on the wall temperature magnitude. It is found that the proposed iterative technique has ...

The topologies are obtained for accretion flows around black holes as the parameters, accretion rate and specific angular momentum are varied. Paczyński-Wiita pseudoNewtonian potential is used to mimic the gravitational field of a Schwarzschild black hole. Both stellar mass(14M⊙) and supermassive(10 M⊙) black holes are considered. The effects of bremsstrahlung and synchrotron cooling processes ...

the present paper describes the designing of a thermally and economically optimum mechanical draft counter-flow wet cooling tower. the design model allows the use of a variety of packing materials in the cooling tower toward optimizing heat transfer. once the optimum packing type is chosen, a compact cooling tower with low fan power consumption is modelled within the known design variables. mor...

in the present work, an engineering method is developed to predict laminar and turbulent heating-rate solutions for blunt reentry spacecraft at hypersonic conditions. the calculation of aerodynamic heating around blunt bodies requires alternative solution of inviscid flow field around the hypersonic bodies. in this paper, the procedure is of an inverse nature, that is, a shock wave is assumed a...

We demonstrate that a suspended nanowire forming a weak link between two superconductors can be cooled to its motional ground state by a supercurrent flow. The predicted cooling mechanism has its origins in magnetic field induced inelastic tunneling of the macroscopic superconducting phase associated with the junction. Furthermore, we show that the voltage drop over the junction is proportional...

We examine the long-standing cooling flow problem in galaxy clusters with 3D MHD simulations of isolated clusters including radiative cooling and anisotropic thermal conduction along magnetic field lines. The central regions of the intracluster medium (ICM) can have cooling timescales of ∼ 200 Myr or shorter—in order to prevent a cooling catastrophe the ICMmust be heated by some mechanism such ...

PURPOSE Vasospasm has been associated with glaucoma, but its mechanisms have not been elucidated. The present study was designed to evaluate the role of endothelin (ET)-1, a potent endogenous vasoconstrictor, in the genesis of vasospasm in glaucoma. METHODS Our sample contained patients with open-angle glaucoma (n = 43) and subjects with normal nonglaucomatous eyes and without acral vasospasm...

A numerical study on the influence of forward-facing cavity length upon forward-facing cavity and opposing jet combined thermal protection system (TPS) cooling efficiency under hypersonic flow is conducted, by means of which the flow field parameters, heat flux distribution along the outer body surface are obtained. The numerical simulation results are validated by experiments and the cooling e...