Mechanical Engineer's Reference Book, Edition: 12th ed., by E H Smith

By E H Smith

Specialists from academia and have contributed sections on their parts of craftsmanship to supply the most complete resources of knowledge for engineers. one of several matters coated are tribology, nuclear and offshore engineering, health and wellbeing and protection and the various functions of pcs in engineering. the big variety of topics coated, the concise yet readable sort, the big variety of illustrations and the wide reference lists make this publication probably the most important volumes to be had on mechanical engineering.

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4 Gas flow measurement Gas f l o w rates through ducts will normally be measured using devices and techniques similar to those used for incompressible fluids, namely orifice plates, venturi meters and nozzles. However, for gases the flow rate is usually quoted as a mass flow rate. 112) may be used with orifices and venturis as well as nozzles. Relevant values of C, for leach device wiil be found in BS 1042, in addition to operational advice. 58) may be acceptable for low flows with low pressure differences.

40) where v is the average flow velocity. 37) may be adapted to incude a head 1/24 Mechanical engineering principles loss term, h ~ Applied . 41) where the head loss term hL is the loss of energy per unit weight of fluid flowing. Note that if a pump, say, is introduced between ( 1 ) and ( 2 ) an energy gain per unit weight term h , , equivalent to the output of the pump written as a head, should be added to the left-hand side of the equation to give where m is the ratio of the cross-sectional area of flow to the wetted perimeter known as the hydraulic mean diameter and C is a coefficient which depends on the condition of the pipe wall.

69) 1/28 Mechanical engineering principles Cis the Chezy coefficient, a function of Reynolds’ number Re and the friction coefficient f for the channel wall and i is the gradient of the channel bed. 6. m is the ratio of the crosssectional area of flow to the wetted perimeter (the length around the perimeter of the cross section in contact with liquid), known as the hydraulic mean depth. 71) = ~ ~ 0 . 16 ’ 7 Q j where M is the Manning number which depends, like the Chezy coefficient, on the condition of the channel walls.

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