TY - JOUR
TI - Design and manufacturing of forming molds for thermal storage materials and analysis of their thermal storage structures
AU - Qian Jun
JN - Thermal Science
PY - 2024
VL - 28
IS - 2
SP - 1191
EP - 1199
PT - Article
AB - In response to the shortcomings of concentrated stress, difficult forming,  and short service life of commonly used honeycomb ceramic thermal storage  materials with square lattice holes, the author has developed a new type of  low stress honeycomb ceramic thermal storage material by studying the  structure, forming mold, and extrusion forming material of the thermal  storage body. The author introduced the changes in specific surface area and  porosity of heat storage materials with different geometric structures, and  analyzed and compared the structural characteristics of two types of heat  storage materials, namely heat storage balls and honeycomb bodies, under  the premise of equal heat storage capacity. The trajectory of air-flow in  the heat storage chamber was simulated using CFD software, and the pressure  loss and centerline velocity changes of different shapes of honeycomb were  analyzed. The flow characteristics, pressure distribution, and heat transfer  performance of gas inside different shapes of honeycomb were calculated. The  experimental results showed that the closer to the circular shape, the  smaller the pressure loss of the centerline. The larger the equivalent  diameter, the smaller the resistance along the path. From the perspective of  cold pressure loss alone, regular quadrilateral holes and regular circular  holes are the best choices for the shape of honeycomb openings. The  centerline velocity of the equilateral triangle hole is the largest,  indicating that the smaller the equivalent diameter is, the greater the  average velocity at the outlet is. The resistance along the path of the  round hole is the smallest, the regular quadrilateral hole is slightly  larger, and the pressure loss of the equilateral triangle hole is the  largest, which exceeds the round hole by nearly 1/3. Taking into account  factors such as heat storage, specific surface area, flow characteristics,  and heat transfer characteristics, quadrilateral honeycomb cells are the  best choice.