Although modern hot air circulation oven technology has a history of more than 100 years, it still belongs to the field of experimental science. Most of the drying techniques are currently also micro-tubes that can accurately guide the scientific theory and design methods of practice. In practical applications, it is still the main way to rely on the data of small-scale trials in the province.
Some of the basic disciplines supported by hot-air circulating oven drying technology are mainly subject to the scope of transfer engineering, and they have the characteristics of experimental science. For example, the development of aerodynamic research is driven by the “wind tunnel†test, indicating that it has not left the scope of experimental science. The development level of these basic disciplines directly affects and determines the development level of hot air circulation oven drying technology.
Many hot air circulation oven drying processes are the process of the intersection of hook and sinking technology, involving a wide range, a large number of variables, and a complicated mechanism. For example, in the field of spray drying technology, the trajectory of atomized droplets in a drying tower is the key to engineering design. The trajectory of the droplet is related to its volume, mass, initial velocity and direction, and the flow and velocity of other droplets and hot air around it. However, due to the mass transfer and heat transfer, these parameters are constantly changing. Moreover, in the initial state, neither the size of the droplet nor the distribution of the hot air is uniform. Obviously, engineering design based on theoretical calculations for such complex and varied processes is not reliable.
The types of materials dried by the hot air circulation oven are various, and their physical and chemical properties are also different. The mass transfer and heat transfer rates of different materials may vary greatly even under the same drying conditions. If not treated differently, it may have unsatisfactory consequences. For example, the drying of some Chinese herbal medicines, although belonging to the same medicinal materials, must change the drying conditions only because of the difference in the origin or harvest period of the medicinal materials, otherwise the quality of the products may be unqualified.
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