subject
Engineering, 12.08.2020 06:01 KOAL

slader Annular aluminum fins of rectangular profile are attached to a circular tube having an outside diameter of 50 mm and an outer surface temperature of 250°C. The fins are 4 mm thick and 30 mm long. The system is in ambient air at a temperature of 20°C, and the surface convection coefficient is 40 W/m2·K. (a) What are the fin efficiency and effectiveness? (b) If there are 125 such fins per meter of tube length, what is the rate of heat transfer per unit length if tube?

ansver
Answers: 2

Other questions on the subject: Engineering

image
Engineering, 03.07.2019 14:10, BardiFan
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.
Answers: 3
image
Engineering, 03.07.2019 15:10, breannaasmith1122
Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.
Answers: 1
image
Engineering, 04.07.2019 16:10, Arealbot
The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.
Answers: 1
image
Engineering, 04.07.2019 18:10, ashleybaber4966
If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79
Answers: 1
You know the right answer?
slader Annular aluminum fins of rectangular profile are attached to a circular tube having an outsid...

Questions in other subjects:

Konu
Mathematics, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01
Konu
Social Studies, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01
Konu
History, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01
Konu
Mathematics, 14.09.2020 15:01