Question Solved1 Answer 4.28. Air flows at a mean velocity of 1.5 m/s between flat plates that can be assumed to be at a uniform temperature of 40°C. The plates have a length of 20 cm in the direction of air flow and are wide in the other direction and the gap between the plates is 4 mm. The initial air temperature is 20°C and the flow can be assumed to have a uniform velocity at the inlet to the system. Can the flow between the plates be assumed to be fully developed? Evaluate the air properties at a temperature of 30°C.

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Transcribed Image Text: 4.28. Air flows at a mean velocity of 1.5 m/s between flat plates that can be assumed to be at a uniform temperature of 40°C. The plates have a length of 20 cm in the direction of air flow and are wide in the other direction and the gap between the plates is 4 mm. The initial air temperature is 20°C and the flow can be assumed to have a uniform velocity at the inlet to the system. Can the flow between the plates be assumed to be fully developed? Evaluate the air properties at a temperature of 30°C.
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Transcribed Image Text: 4.28. Air flows at a mean velocity of 1.5 m/s between flat plates that can be assumed to be at a uniform temperature of 40°C. The plates have a length of 20 cm in the direction of air flow and are wide in the other direction and the gap between the plates is 4 mm. The initial air temperature is 20°C and the flow can be assumed to have a uniform velocity at the inlet to the system. Can the flow between the plates be assumed to be fully developed? Evaluate the air properties at a temperature of 30°C.
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Solution:According to the Given condition:Given data:AlorProperties of air at T=40^(@)C from the data table is given as:{:[" Kinematic "],[" Viscusity "P=1.702 xx10^(-5)m^(2)//sec],[" conductivity "K=0.026621H//mK],[" Pr "=0.7255]:}calculate the Reynold no.{:[Re=(SVD_(hh))/(u)=(VD_("th "))/(v)],[R_(e)=(3xx2xx10^(-2))/(1.702 xx10^(-5))],[" Noth "],[Re=3532.26],[D_("th ")rarr" hydraulic "],[P_(+h)=(HA)/(P)=L]:}at Re of 3532 ... See the full answer