نتایج جستجو برای: preheat
تعداد نتایج: 338 فیلتر نتایج به سال:
The present study investigates the fracture toughness of FSW X80 HSLA steel welds. Weld cooling rate and peak temperature were varied among welds; indirectly manipulated through travel speed, rpm, weld preheat. Fracture was tested according to ASTM 1820 standard along centerline using surface-notched SEB specimen cooled −40 °C. Results demonstrate that CTOD has a strong inverse linear correlati...
A model for heat-recirculating micro combustor is developed. It investigates the structure of laminar, one-dimensional and steady state flame propagation in uniformly premixed wood particles with considering the effects of heat recirculation caused by configuration of micro combustor. The flame structure is divided into three regions: a preheat-devolatilization zone where the rate of the gas-ph...
Low radiation intensity heat transfer from methane blue flame has turned into a challenge in industry. The addition of soot into the flame can enhance the radiation. However, the effect of adding soot on chain reaction of methane combustion and NO & CO emissions has not been assessed. Furthermore, one of the most important factors to be considered is the size of the fine particles. Therefore, t...
In this study, hydrolysis reaction performances of raw BFS powder and metal powders (which are ingredients BFS) that using as a catalyst compared. Hydrogen generation by the Al Fe2O3 Nano & Granule with sodium borohydride (NaBH4) addition in water was studied different catalysts amount at vessels. The measured values temperatures hydrogen flow rates were high-precision equipment. As result ...
Abstract To use energy systems based on renewable sources, it is very important to consider backup and hybrid sources because energies are not available all the time; therefore, in this system, a geothermal pump used preheat fluid, then heated fluid sent vacuum tube collector reach higher temperature by absorbing solar-thermal energy, after solar goes evaporator produce superheated steam finall...
Crude refinery preheat trains (PHTs) are a major part of a refining process as these units reduce the amount of thermal energy required to heat the crude oil to its distillation temperature. Fouling is a longstanding problem in the operation of PHTs; the ability of a refinery to process different crude blends or to increase its production capacity depends on the thermal and hydraulic performanc...
Planar laser-plasma interaction (LPI) experiments at the National Ignition Facility (NIF) have allowed access for the first time to regimes of electron density scale length (∼500 to 700 μm), electron temperature (∼3 to 5 keV), and laser intensity (6 to 16×10^{14} W/cm^{2}) that are relevant to direct-drive inertial confinement fusion ignition. Unlike in shorter-scale-length plasmas on OMEGA, ...
Effect of preheat repetition on color stability of methacrylate- and silorane-based composite resins
Background. The aim of this study was to investigate the effect of preheating methacrylate- and silorane-based composite resins on their color stability up to 40 times at 55‒60°C. Methods. Seventy-six methacrylate and silorane-based composite resin samples, with a diameter of 10 mm and a height of 2 mm, were divided into 4 groups (n=19). After the samples were prepared, their color parameters w...
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