MEMS (Micro-Electro-Mechanical System) is characterized by its small size, easy multi-functional integration, high-volume manufacturing process and greatly reduced cost. It shows a broad application prospect and its application potential in fluids is also very attractive. China's MEMS research also has many advanced achievements. Ding Jiexiong, a professor at the School of Mechanical and Electronic Engineering of Chengdu University of Electronic Science and Technology, is one of the "methods for ultrasonic suspension particle separation based on multimode resonance in MEMS".
Professor Ding Jiexiong believes that for mixed fluids containing suspended particles, suspended particles are often the core of the problem. Ultrasonic energy produces an average force on the suspended particles in the fluid, which can be used to control the movement of suspended particles to achieve particle separation. Due to the structural characteristics of MEMS, many macroscopically commonly used separation methods are limited by this, and ultrasonic devices are easily compatible with MEMS in the manufacturing process. The technology of ultrasonic treatment of suspended particles has great potential application value, especially with biological The influence of technology on human society has been continuously strengthened, and its social and economic value is even more incalculable. Based on the MEMS separation method using ultrasonic multilayer resonance and laminar flow proposed abroad, Professor Ding Jiexiong combined with MEMS structure and process characteristics to study the ultrasonic suspension particle separation method based on cavity multimode resonance, including the microscopic two-dimensional standing wave sound field. The resonant cavity structure model, the construction and optimization of microfluidic channels and inlet and outlet structures, the experimental research on the development of micro-separation devices and the factors affecting the separation effect have a high level.
An air heat exchanger is a device that is used to transfer heat between two air streams. It is commonly used in heating, ventilation, and air conditioning (HVAC) systems. The heat exchanger can be designed to allow the two air streams to be either separately or together.
Generally, we classify the air heat exchanger into Finned Tube Heat Exchanger, Plate Type Air Heat Exchanger, Seamless Pipe Air Heat Exchanger, Twisted Heat Exchanger, etc. according to its structure.
Air heat exchangers are commonly used for a variety of applications in the HVAC system, such as space heating, cooling, humidification and air circulation. In space heating applications, air heat exchangers are used to transfer heat from outside air to indoor air, in order to provide heat for the building. In cooling and air circulation applications, air heat exchangers are used to transfer heat from an indoor space to the outside. in order to keep the building cool.
The main advantage of using an air heat exchanger is that it is very efficient in transferring heat energy between the two streams without any loss. It is also relatively inexpensive, compared to other types of heat exchangers. Additionally, air heat exchangers are small and compact, making them ideal for applications in tight spaces.
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