The hailstorm occurred on July 6 to 8,2003 over the northeast of Qinghai-Xizang plateau was simulated by using MM5,and its meso-scale circulation background and local convective cells characteristics were analyzed based on simulated data.

The results show that (1) MM5 is good to simulating this hailfall process, (2) Warm humid air from south at lower level and cold dry air from northwest at middle and upper level and local terrestrial factors were important, (3) Convective cells formed at high altitude plots firstly and then spread to lower altitude, (4) .

This paper has investigated the development of the shallow band convection cell in nonuniform basic flow by using WKBJ method.

To reveal the influence of forced convection on gas shielded arc welding temperature field,the infrared camera was used to investigate the temperature field of the base metal in CO2 arc welding.

Three-dimensional physical and mathematical models for the coupled heat transfer of natural convection in a liquid pool with heat source and forced convection in cooling coil tube are established.

The experimental data of single-phase forced convection and subcooled boiling in the narrow channel were compared with calculated values of the traditional Dittus-Boelter correlation respectively.