By E E Khalil
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According to the recommendations of Launder et al. 1. These constants were found appropriate for plane jets and mixing layers. , Launder et al. (1972, 1973). 1 shows some of the flows that had been tested and reasonable agreement was obtained; the figures quoted are still valid and used to date in many applications. 3 Near wall grid node. In region of flow near a wall the velocities tend to zero at the wall, and hence there are zones where the local values of Rew are so small and the viscous effect is dominant.
1972, 1973). 1 shows some of the flows that had been tested and reasonable agreement was obtained; the figures quoted are still valid and used to date in many applications. 3 Near wall grid node. In region of flow near a wall the velocities tend to zero at the wall, and hence there are zones where the local values of Rew are so small and the viscous effect is dominant. A large number of grid nodes are needed if the momentum equations are to be solved at each node. 64) The constants of the logarithmic law of the wall, κ and E, depend on the wall roughness.
To identify the spectrum content on noise, the use of noise criteria (NC) is proposed. Generally levels below NC 30 are considered to be quite; noisy conditions refer to NC greater than 50 to 55. 1 indicates the ASHRAE recommended noise criteria for various applications. Generally, design goals for air conditioning system sound control for indoor areas will be in accordance with the ASHRAE system handbook17 as summarized below; the design should incorporate provisions for sound control in order to achieve an appropriate sound level for all activities and people involved.
Air distribution in buildings by E E Khalil