Thermofluids by Michael Horsley, Sherwin Keith

By Michael Horsley, Sherwin Keith

The 2 linked matters of thermodynamics and fluid mechanics are mixed during this publication to supply the reader with an easy-to-follow textual content which emphasizes the basic coherence of the fabric.

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Thermofluids

The 2 linked topics of thermodynamics and fluid mechanics are mixed during this publication to supply the reader with an easy-to-follow textual content which emphasizes the basic coherence of the fabric.

Extra resources for Thermofluids

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This will be discussed later in Chapters 13 and 14. For the present, it is proposed to quote this group to show its dimensionless nature. Reynolds number is defined in terms of a flow length, I, flow velocity, v, fluid properties of density, p, and viscosity, 11: Re = pvl. 11 In terms of their dimensions, the four variables in this group can be expressed, as (kgm-3)(ms-1)(m) _ l' (kgm 1s 1) -, that is, dimensionless. Dimensionless groups are particularly useful in relating thermofluid devices or situations involving a range of geometries or flow characteristics.

Water is pumped from the pond to the nozzle from which a vertical jet of water emerges to form the fountain. 6 A fountain as a system. fountain re-enters the pond and, assuming no loss of water due to evaporation, the amount of water remains constant. 6, defines a closed system. 7. It can be seen that this new boundary has a flow of water in and a flow of water out. The water within the region defined by the boundary is not fixed but is continually changing. Therefore, the region within this boundary is an open system.

A modern supersonic fighter has its top speed quoted as a Mach number. This is because the actual speed is related to the speed of sound, which varies with both altitude and ambient temperature. The Mach number is defined as the actual velocity with relation to the local speed of sound: Ma = via. In terms of their dimensions the two variables can be expressed as (ms- 1)/(ms- 1) = 1 that is, the Mach number is a dimensionless group with no overall dimensions. 10 Is the compression ratio of a car engine dimensionless?

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