It is a cross-industry and interdisciplinary technique. There is a wide range of services; It is still in the field of experimental science; In the face of numerous industries, the physical and chemical properties of different materials, the quality of products and other aspects of the requirements are varied; There is no scientific theory and design method for most drying technology in our country. Machinery factory in the mineral processing equipment industry of our country and before drying device, must be adequately, persuasive test, and the test results as the basis of industrial plant construction.
Some basic disciplines, which are supported by the dry technology of drying equipment, have the characteristics of experimental science. The development of aerodynamics has to be driven by the wind tunnel test, which suggests that it is not yet out of experimental science; The development level of these basic disciplines directly influences and determines the level of development of drying technology.
The dry process of drying equipment is a process of the intersection of various kinds of disciplines, which involve wide, variable and complicated mechanism. For example, in the area of spray drying, the trajectory of the atomised droplets in the dry tower is the key to engineering design; The trajectory of the droplet is related to the volume, mass, initial velocity and direction of the droplets and the flow of the other droplets in the surrounding area. But these parameters vary greatly because of the process of transfer and heat transfer. And the initial state, whether it's the size of the droplet or the distribution of the hot wind, can't be uniform; It is clear that engineering design is unreliable for such complex and varied processes only by theoretical calculation.
The types of dried materials are varied, and their physical and chemical properties are different. Different materials, even under the same drying conditions, may have large differences in transmission and heat transfer rates; If we do not discriminate, we may have undesirable consequences; For example, some Chinese herbal medicine drying, although belong to a kind of herbs for medicinal materials only change or harvest distinction must be made in dry conditions, or the quality of the products will not qualified.
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