An experimental study on flash evaporation process in static flash evaporation of aqueous NaCl solution was presented. Experiments were carried out with initial concentration of waterfilm varied from 0 to 0.15, initia...
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An experimental study on flash evaporation process in static flash evaporation of aqueous NaCl solution was presented. Experiments were carried out with initial concentration of waterfilm varied from 0 to 0.15, initial height from 0.1 to 0.4 m, and superheat from 1.8 to 49.5 K. Instant superheat was the driving force during flash evaporation. A negative correlation was found between temperature drop rate and instant superheat. Instant heat transfer coefficient increased with the increase of instant superheat. A peak value of instant superheat existed during static flash. The evolution of instant superheat was affected by initial superheat, or initial height, or initial concentration of waterfilm.
Two-phase flashing spray holds a special interest in the safety area. High pressure liquids or liquefied gases accidentally released from small hole in chemical or nuclear industry can form two-phase mixtures due to t...
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Based on the PINN neural network for the study of turbulence, it can solve the nonlinear equations without grid, which is different from the CFD method. This paper mainly uses the PINN method to study the temporal and...
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Optical losses account for 40% of all the losses in a central receiver system. These optical losses occur due to factors like shading, blocking, atmospheric attenuation, spillage, cosine loss, and mirror reflectivity....
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Instantaneous detailed flame front structure of syngas turbulent premixed flames was investigated and compared to that of CH4/air flames. Results show that the flame front of turbulent premixed flames at high pressure...
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Instantaneous detailed flame front structure of syngas turbulent premixed flames was investigated and compared to that of CH4/air flames. Results show that the flame front of turbulent premixed flames at high pressure is a wrinkled flame front with small scale convex and concave structures superimposed with large scale flame branches. The convex structures are much more frequent than the concave ones on flame front which reflects a general characteristic of the turbulent premixed flames at high pressure. The syngas flames possess much wrinkled flame front with much smaller fine cusps structure compared to that of CH4/air flames and the main difference is on the convex structure. The effect of turbulence on the general wrinkled scale of flame front is much weaker than that of the smallest wrinkled scale. The general wrinkled scale is mainly dominated by the turbulence vortex scale, while, the smallest wrinkled scale is determined by the flame intrinsic instability. The effect of flame intrinsic instability on flame front of turbulent premixed flame is mainly on the formation of a large number of convex cusps structure propagating to the unburned reactants and enlarge the effective contact surface between flame front and unburned reactants.
Low pressure premixed laminar n-heptane/propane/O2/N2 flames were investigated with tunable synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam sampling mass spectrometry. Three flames with differe...
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