1. Thin steel plates are subjected to a steady stream of air flowing along their surface at 2 m/s. The plates are held at 40 deg C while the air temperature outside the BL is 90 deg C. The plates are 1 m long in direction of the air flow, and 2 m across (= width). Estimate the average convection coefficient for the entire plates as well as the heat transfer rate. The relevant air properties at around the film temperature are: 1.038 kg/m3; 1009 J/(kg-K); 2.042E-05 Pa-s; 0.0293 W/(m-K). 2. Air is flowing through a 20 m long pipe of 20 cm diameter at a rate of 0.5 kg/s. The inlet air temperature is 40 deg C; the entire pipe wall is held at a constant temperature of 90 deg C. Estimate the air temperature at the outlet as well as the heat transfer rate for the entire length of the pipe. Use the air properties as given in Q 1. Heat transfer. Solve no.2 please.

1. Thin steel plates are subjected to a steady stream of air flowing along their surface at 2 m/s. The plates are held at 40 deg C while the air temperature outside the BL is 90 deg C. The plates are 1 m long in direction of the air flow, and 2 m across (= width). Estimate the average convection coefficient for the entire plates as well as the heat transfer rate. The relevant air properties at around the film temperature are: 1.038 kg/m3; 1009 J/(kg-K); 2.042E-05 Pa-s; 0.0293 W/(m-K). 2. Air is flowing through a 20 m long pipe of 20 cm diameter at a rate of 0.5 kg/s. The inlet air temperature is 40 deg C; the entire pipe wall is held at a constant temperature of 90 deg C. Estimate the air temperature at the outlet as well as the heat transfer rate for the entire length of the pipe. Use the air properties as given in Q 1. Heat transfer. Solve no.2 please.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

1. Thin steel plates are subjected to a steady stream of air flowing along
their surface at 2 m/s. The plates are held at 40 deg C while the air
temperature outside the BL is 90 deg C. The plates are 1 m long in
direction of the air flow, and 2 m across (= width). Estimate the average
convection coefficient for the entire plates as well as the heat transfer
rate. The relevant air properties at around the film temperature are: 1.038
kg/m3; 1009 J/(kg-K); 2.042E-05 Pa-s; 0.0293 W/(m-K).
2. Air is flowing through a 20 m long pipe of 20 cm diameter at a rate of
0.5 kg/s. The inlet air temperature is 40 deg C; the entire pipe wall is held
at a constant temperature of 90 deg C. Estimate the air temperature at
the outlet as well as the heat transfer rate for the entire length of the
pipe. Use the air properties as given in Q 1.
Heat transfer. Solve no.2 please.

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