上下冲击式速冻机流场和换热特性研究现状

目的 为了提高食品冻结的品质,需要对冲击式速冻机的结构尺寸和内部流场进行优化,改善冲击式速冻机的冻结效率.方法 综述影响该类速冻机换热特性的4个因素,即喷嘴的形状和尺寸,射流阵列的排布,喷嘴到输送带距离和喷嘴间距的改变,速冻机进出口压差等.结果 通过回顾计算流体力学技术和实验研究在这4个方面优化速冻机换热特性的案例,总结了上下冲击式速冻机流场变化的规律.结论 该研究为新型速冻机的优化设计提供了理论支撑.

Current Situation of Flow Field and Heat Transfer Characteristics of an Upper and Lower Impact Freezer

This paper studies the specific application of blockchain technology in the field of food safety, especially in the quality and safety monitoring of fresh food cold chain logistics, so as to strengthen food quality and safety management and improve the efficiency of food cold chain supply chain. This paper analyzes the weak links of fresh food cold chain logistics quality and safety management, demonstrates the applicability of block chain technology in food cold chain quality and safety monitoring, builds a food cold chain quality and safety information platform with block chain as the underlying technology, and studies the promotion effect of innovative application of block chain technology on food cold chain quality and safety management. The application of blockchain technology to build a fresh food cold chain quality and safety information platform with unified data, efficient operation, real-time collection of food quality and safety information, real-time early warning of quality and safety risks, effective traceability of quality and safety problems, help to reshape the food quality and safety ecosystem. The food cold chain quality and safety information platform based on blockchain technology, a combination of a series of core technologies, such as distributed ledger, digital signature, and traceability, can strengthen microbial contamination monitoring, shorten the travel time of food cold chain, and effectively track and trace the source of quality and safety problems. It is of great significance to strengthen food quality and safety management and promote the optimization of fresh food supply chain.