This Paper analyses the scraping principle and mechanical charater for the centrifugal scraper of an ice cream freezer, deduces theoretical formula of the minmal rotation speed meeting contact scraper of agitator.

This thesis deduces the formula of minimum unlock speed of jointed rotating disc and bearing by using the theory of elastic mechanics, and this provides the theoretical basis for confirming the rated speed of rotating disc.

Furthermore,a new equation was deduced to predict minimum fluidization velocity of the mixture of biomass particles and sands.

According to the study on conventional fluidized bed,a correlation for predicting bed voidage at minimum fluidization and minimum fluidization velocity,giving agreement with experi.

In order to determine the influence of coarse magnetic powder amount on the fluidization characteristics of non-magnetic cohesive powders, the minimum fluidization velocity and pressure drop were measured.

It focuses on reviewing the effect of temperature on the minimum fluidization velocity, minimum fluidization voidage, bed expansion ratio, and bubble diameter, which are in relation with the design and operation of fluidized beds.

Meanwhile,the minimum fluidization velocity for sand/vegetable seeds mixtures were also s.

The experimental results showed that IHI ash belonged to B group; Re numbers were less than 40 when the bed temperature was increased from ambient temperature to 1 000 ℃;And that the minimum fluidizing velocity of material particles decreased with increasing the bed temperature.

The minimum fluidizing velocity of pyrite ore is measured in a cylindric Plexiglass fluidized bed with 285 mm in diameter.