Based on an effective energy conversion method between gas enthalpy and thermal radiation, a multi-layered type of porous air heater has been proposed. In the five layered structure which is analyzed in this work, there are five porous layers which are separated by four quartz glass windows. The main layer operates as a porous radiant burner that products a large amount of thermal radiative ene...

The modulation instability of surface capillary-gravity water waves is analysed in a shear flow model with tangential discontinuity velocity. It assumed that air blows along the uniform profile vertical direction. Such model, despite its simplicity, plays an important role hydrodynamics as reference for investigating basic physical phenomena wave–current interactions and acquiring insights into...

This paper deals with the hydrodynamic and thermal analysis of a new type of porous heat exchanger (PHE). This system operates based on energy conversion between gas enthalpy and thermal radiation. The proposed PHE has one high temperature (HT) and two heat recovery (HR1 and HR2) sections. In HT section, the enthalpy of flowing high temperature gas flow that is converted to thermal radiation em...

We present a theoretical model fit to the HST/STIS optical transit transmission spectrum of HD209458b. In our fit, we use the sodium absorption line profile along with the Rayleigh scattering by H2 to help determine the average temperature-pressure profile at the planetary terminator, and infer the abundances of atomic and molecular species. The observed sodium line profile spans an altitude ra...

Aims. We study chromospheric emission to understand the temperature stratification in the solar chromosphere. Methods. We observed the intensity profile of the Ca iiH line in a quiet Sun region close to the disk center at the German Vacuum Tower Telescope. We analyze over 10 line profiles from internetwork regions. For comparison with the observed profiles, we synthesize spectra for a variety o...

We present radiative-hydrodynamic simulations of solar flares generated by the RADYN and RH codes to study perturbations induced in photospheric Fe i lines electron beam heating. investigate how variations parameters result discernible differences velocities. Line synthesis revealed a significant chromospheric contribution line profiles resulting an apparent red asymmetry as much 40 m s−1 close...

This study investigates the direct radiative-convective processes that drive and maintain aggregation within convection-permitting elongated channel (and smaller square) simulations of UK Met Office Unified Model. Our are configured using three fixed sea surface temperatures (SSTs) following Radiative-Convective Equilibrium Model Intercomparison Project (RCEMIP) protocol. By defining cloud type...

abstract: this work presents a numerical study to investigate the heat transfer characteristics of a 2-d rectangular composite porous radiant burner (cprb). in the construction of porous burner, the porous layer is considered to be composite consisting of upstream and downstream layers with equal thickness but with different physical and radiative properties. in the present work, a two dimensio...

ADiesel cycle enginewith internal and external irreversibilities of finite combustion rate of the fuel, friction and heat leakage is investigated in this paper. The heat transfer between the working fluid and the environment outside the cylinder obeys generalized radiative heat transfer law [q ∝ ∆(T n)]. Under the conditions of the fixed total cycle time and fuel consumed per cycle, the optimal...