Dispersing a gas through the liquid in the form of small bubbles.Ī typical application of propeller agitator is in mixing of high viscosity liquids or solid in solids. Dispensing a second liquid, immiscible wt h the first to form an emulsion or suspension of fine dropsĥ. Blending immiscible liquids, for example, methyl alcohol and water.ģ. Promoting heat transfer between the liquid and a coil or jacketĢ. Liquids are agitated for a number of purpose, depending on the objective of the processing step, soe of the purpose includesġ. As with other equipments, the choice of an agitator for heavy material is always a compromise and arbitrary. In a given problem, the agitator given must handle the material when it is in it’s worst condition and may not be so effective as other design during other parts of mixing cycle. Ideally, the equipment chosen should be that which has the lowest cost but meets all process requirement. The selection of a particular agitator for a particular purpose requirement, the flow properties of the process fluid, equipment cost and the construction material required must be considered. The product obtained should either be homogenous or heterogeneous depending on demand or desired product. In most homes, industries and chemical operations, two or more substances are required to be mixed for users demand, in mixing as a unit operation, the substance is fed into the vessel or mixing tank containing the agitator in either one form, liquid, solid or gas. In chemical engineering, it is conventional to treat agitation and multi purpose operations for which the principles of equipment design and operation can be stated generally, such operations in agitation like crystallization, Ion exchange and colliding are advanced of this study and construction. The term agitation is applied to a variety of operations differing in the degree of homogeneity of the mixed material. This is probably the most useful description of mixing as it allows the adoption of a unified approach to the problems encountered in a range of industries. Several attempts have been made to classify mixing problems, and for example “REAVELL” used as a criterion for mixing of powders, the flowability of the final products, HARNEY et al based their classification on the phases present, that is liquid – liquid, solid – liquid and so on. Mixing is achieved by moving material from one region to another. It may be of interests simply as a means of achieving a desired degree of homogeneity or it may be used two proote heat undergoing a chemical reaction.Īt the outset I t is useful to consider some common examples of problems encountered in industrial mixing operations, since this will nto only reveal the ubiquitous nature of the process but will also provide an appreciation of some of the associated. The terms “mixing” is applied to the processes used to reduce the degree of non uniformity or gradual of a property in a system such as concentration, viscosity, temperature and so on. Propeller agitator mixing is one of the most common operations carried out in chemical, processing and allied industries. The cost of construction of the agitator is however minimized due to the preferred choice of the raw material and method of fabrication. The estimated rate of rotation is 1720 rpm. The agitating mixer has high efficiency of comparable to those produced industrially. These are length of handle = 320mm, diameter of gear teeth = 100mm, thickness of shaft = 20mm, thickness of gear = 12mm, size of blade = 50mm x 100mm, blade diameter = 63mm, inside diameter of pump = 12mm, outside diameter of pump = 20mm, shat height = 470mm, vessel diameter = 340mm and height = 560mm The shapes and forms are formulated to obtain the following dimensions of the agitator. After the procurement, the following constructional operations were carried out which included marking out, center punching folding, welding, filling operation, assembling, and painting to beautify the equipment and for other purposes. In the construction, mild steel was chosen due to it’s inherent properties. It consists of three basic components which are the shaft, blade and the vessel. Propeller agitator is a specialized of various types of substances.
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