Factors influencing application design

Factors Influencing Apparatus Design. Practical application of the theory presented above depends on the validity of a number of assumptions. One, which has already been mentioned, is the assumption that the flow is laminar. It has been shown by dimensional analysis that, for any given type of hydrodynamic experiment, the conditions for onset of turbulent flow depend on the magnitude of a certain combination of pertinent experimental variables that is a pure number, called the Reynolds number Re. For flow through a long, round, straight tube. 

Technical requirements Sound engineering practice, essential requirements tarticle 3t The directive includes a particular technical requirement with respect to equipment which presents only a minor pressure hazard. For such equipment the essential requirements and the certification procedures are not applicable. Instead the so-called sound engineering practice of one of the Member States must be applied. That practice must ensure that design and manufacture takes into account all relevant factors influencing safety during the intended lifetime. The equipment must be accompanied with adequate instruetions for use and must bear the identification of the manufacturer. The CE-marking shall not be applied for such equipment. 

Even though many potential factors can influence a design analysis, each application fortunately usually involves only a few factors. For example, TPs properties are dominated by the viscoelasticity relevant to the applied load. Anisotropy usually dominates the behavior of long-fiber RPs. 

Problem 2.10 The Application of a Plackett-Burman Design to the Screening of Factors Influencing a Chemical Reaction... 

Eraser, A. J. and V. B. Keeble, Factors Influencing Design of Protective Clothing for Pesticide Application, Performance of Protective Clothing, Second Symposium, ASTM STP 989, Mansdorf, S. Z., Sager, R., and A. P. Nielsen, Eds., American Society for Testing and Materials, Philadelphia, pp. 565-572, 1988. 

Source of Activity in Zeolites.—Most of the experimental work designed to elucidate the catalytically active sites in zeolites has used faujasitic zeolites. This has been reviewed recently in detail.Much is broadly applicable to non-faujasitic zeolites, but in this section three factors influencing catalytic activity are emphasized silica/alumina ratio crystal structure modification of the zeolite by thermal treatment, cation exchange, etc. 

In general, low-loaded boilers do not justify the use of heat recovery equipment. In other applications, it may very well be worthwhile. The need for heat recovery equipment is sometimes difficult for a designer to determine, since he is often insufficiently familiar with the factors influencing an evaluation. In such instances, responsible selection of an economizer or air preheater is not possible. It should be remarked that adding heat recovery equipment means adding something that may influence availability. Fuel, excess air, flue gas temperature, air temperature or feed water temperature play a role here. 

Depending on the application type, there are several determining factors that influence the design of a fuel processor, such as maximum power output, response... 

In recent decades many researchers have performed much work on the corrosion of magnesium alloys. They have studied the corrosion phenomena, the factors influencing corrosivity and the practical applications of magnesium alloys. They have also systematically studied different corrosion cases, compared the corrosion behaviours of different alloys in different environments, proposed some practical designs to avoid serious corrosion, and sununarized various effects of environmental and metallurgical factors on the corrosivity of magnesium alloys. There have, however, been very few mechanistic studies and some fundamental questions remain unanswered. These fundamental problems have potential... 

Each equation used, whether for ((i°, f , or y, has its particular advantages and disadvantages, and limitations on its range of applicability these and other factors influence the selection of the equations, or particular combination of equations used. For example, in many Kellogg design applications the four-suffix Margules form of the Wohl equation for activity coefficients is... 

Moisture has an effect, but its influence may only be significant if components are either highly stressed compared with their ultimate strength or used at temperatures close to the heat distortion temperature of the resin. If either condition is applicable then measurements will be needed to determine the safety factor of the design. BS 5480 recommends an operating temperature of at least lO C below the HDT of the resin for components subject to prolonged exposure to stress. 

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