Papers by Author: Z.M. Shi

Abstract: For great progress in heat pipe technology, a micro heat pipe has become an ideal heat dissipating device in high heat-flux electronic products, and capillary limit is the main factor affecting its heat transfer performance. Based on analyses of capillary limit and currently commonly-used groove structures, this paper built capillary limit models for micro heat pipes with dovetail-groove, rectangular-groove, trapezoidal-groove and V-groove wick structures respectively for theoretical analyses. The analysis results show that better heat transfer performances can be obtained in micro heat pipes with small-angle dovetail (i.e. a sector structure), rectangular and small-angle trapezoidal grooved wick structures when groove depth is 0.2-0.3mm and top-width-to-depth ratio is 1.2-1.5.

Abstract: With the rapid development of static-press technique, multi-point constant oil supply system has been widely applied into bearing the work table of large CNC vertical turning machine. A group method has been proposed through the analysis of the operating principle, structural features and manufacturing method of multi-point gear flow dividers. Then the diversion characteristics of the twelve point gear flow dividers manufactured through this method are compared with those of the dividers alike both at home and abroad. The experimental results show that the multi-point gear flow dividers manufactured through this group method not only have good diversion accuracy , but reduce the manufacturing cost and assure workbench’s running stability as well as high quality and precision products.