Numerical study on combined buoyancy–Marangoni convection heat and mass transfer of power-law nanofluids in a cubic cavity filled with a heterogeneous porous medium

Effect of the crucible/crystal rotation on thermocapillary instability in a shallow Czochralski configuration

A fluid experiment was conducted on China's SJ10 satellite to assess the instability of thermocapillary convection under microgravity. Oscillations of thermocapillary convection in an annular pool were investigated when the difference in temperature exceeded a certain threshold. Dynamics and transitions of the wave pattern were observed using an infrared camera. This work is concerned with the effect of the surface configuration on the wave patterns. There are 3 types of surface configurations that depend on the volume ratio: Vr 1 (zone 3). An irregular local wave occurs at Vr 0.65. We observed the regular wave with the wavenumber m = 3 in zone 1 and zone 3 and the competition between m = 3 and m = 4 in zone 2. The nonlinear dynamics of traveling waves, standing waves, and counterpropagating waves were studied. The standing wave appears near the onset and transitions to the traveling wave. With a similar mechanism, counterpropagating waves with m = 3 and m = 4 occur in some cases at the onset. Additionally, counterpropagating waves also act as a transitional mode when the traveling wave transitions from m = 4 to m = 3. The traveling wave is very stable, but it develops into standing waves or Benjamin-Feir instability under highly supercritical conditions. Published under license by AIP Publishing.

Surface configurations and wave patterns of thermocapillary convection onboard the SJ10 satellite

Experimental study on Prandtl number dependence of thermocapillary-buoyancy convection in Czochralski configuration with different depths

Numerical simulation of heat and mass transfer during Czochralski silicon crystal growth under the application of crystal-crucible counter- and iso-rotations

Experimental investigation on the effect of crystal and crucible rotation on thermocapillary convection in a Czochralski configuration

Experimental investigation on effects of crystal and crucible rotation on thermal convection in a model Czochralski configuration

The effect of assembly of coil and field shaper on electromagnetic pulse crimping

As a non-heat input solid-state joining technology, electromagnetic pulse welding (EMPW) has many advantages in the connection of dissimilar metals. Finite element (FE) methods are often used to design the EMPW equipment, explore the parameters and analyze the transient process. However, it is difficult to reflect the welding effect directly. This work proposed a welding effect evaluation model based on the welding window theory and the V c - β trajectory curve obtained in the FE simulation. A FE model coupling the circuit-magnetic-structure field was established in COMSOL software to simulate the EMPW process of the Cu plate and Al plate. The V c - β trajectory curve and welding traces were obtained according to the simulation results. An experimental platform WD-28 was used to carry out the welding experiments of Cu–Al plates at different discharging voltages. The welding traces were measured through SEM method and compared with the simulation results. According to the comparative result, the empirical constant of the calculation formula for the lower boundary of the welding window was adjusted into 1.6, so that the evaluation result was consistent with the experimental result. This work can provide a new method for evaluating directly the welding effect through the FE simulation results. 

Evaluation model of electromagnetic pulse welding effect based on Vc-β trajectory curve

Numerical Simulation on Effect of Rotation on Thermal Convection in a Shallow Model Czochralski Configuration with a Heated Bottom

Ting Shen

Papers

Experimental investigation on the effect of crystal and crucible rotation on thermocapillary convection in a Czochralski configuration

Experimental investigation on effects of crystal and crucible rotation on thermal convection in a model Czochralski configuration

The effect of assembly of coil and field shaper on electromagnetic pulse crimping

Evaluation model of electromagnetic pulse welding effect based on Vc-β trajectory curve

Numerical Simulation on Effect of Rotation on Thermal Convection in a Shallow Model Czochralski Configuration with a Heated Bottom