Experimental and numerical study on the heat transfer and flow characteristics in shell side of helically coiled tube heat exchanger based on multi-objective optimization

Analysis of permeabilities for slug flow in fractal porous media

Simulation and performance analysis on condenser coil in household heat pump water heater

Correlations for predicting single phase and two-phase flow pressure drop in pebble bed flow channels

Research on entrainment characteristics and Over-Reading model for gas-liquid flow in Venturi

Gas-liquid two phase flow with high GVF through a horizontal V-Cone throttle device

Detailed analysis of structural, optical and photo catalytic properties of Spinel Nickel doped Magnesium Zinc Ferrites at different substitutions

Thermosolutal convection and solute segregation during the vertical Bridgman growth of Hg1−xCdxTe single crystals

To understand the movement and evaporation behavior of single droplet in high temperature fuel gas,a mathematical model was proposed by considering the gas-liquid two-phase coupling.The droplet diameter,velocity and average temperature during its evaporating process and the influence of the fuel gas temperature(1 530 K - 2 130 K) and velocity(30 m/s - 60 m/s) were analyzed.The numerical results show that both higher temperature and higher velocity of fuel gas can accelerate the evaporation of droplet.When the fuel gas temperature decreases continuously along the droplet movement direction,a critical droplet diameter for evaporation exists.The evaporation time shortens with the increasing gas velocity as the droplet diameter gets lower than the critical value.However,the trend is contrary to the droplet diameter beyond that value.In the present condition(the temperature of the fuel gas drops from 2 210 K to 1 090 K along 550 mm length),the critical value is 100 μm.The evaporation investigation of a single droplet provides a foundation for the research of spray evaporation in high temperature gas.

Evaporation Investigation of Single Droplet in High Temperature Fuel Gas

An experimental study was conducted on the air-water two-phase flow patterns in the bed of rectangular cross sections containing spheres of regular distribution. Three kinds of glass spheres with different diameters (3 mm, 6 mm, and 8 mm) were used for the establishment of the test section. By means of visual observations of the two-phase flow through the test section, it was discovered that five different flow patterns occurred within the experimental parameter ranges, namely, bubbly flow, bubbly-slug flow, slug flow, slug-annular flow, and annular flow. A correlation for the bubble and slug diameter in the packed beds was proposed, which was an extended expression of the Tung/Dhir model, Jamialahmadi's model, and Schmidt's model. Three correlations were proposed to calculate the void friction of the flow pattern transition in bubble flow, slug flow, and annular flow based on the bubble model in the pore region. The experimental result showed that the modified Tung and Dhir model of the flow pattern transition was in better agreement with the experimental data compared with Tung and Dhir's model.

An Experimental Study on Air-Water Two-Phase Flow Patterns in Pebble Beds

Bai Bofeng

Papers

Gas-liquid two phase flow with high GVF through a horizontal V-Cone throttle device

Detailed analysis of structural, optical and photo catalytic properties of Spinel Nickel doped Magnesium Zinc Ferrites at different substitutions

Thermosolutal convection and solute segregation during the vertical Bridgman growth of Hg1−xCdxTe single crystals

Evaporation Investigation of Single Droplet in High Temperature Fuel Gas

An Experimental Study on Air-Water Two-Phase Flow Patterns in Pebble Beds