e- Water at 12 °C is to be heated to 60 °C by passing it over a bundle of 3-m-long, 2-cm-diameter resistance heater rods maintained at 95 °C. Water approaches the heater rod bundle in normal direction at a mean velocity of 1.2 m/s. The rods are arranged in-line with longitudinal and transverse pitches of SL = 4 cm and ST = 3 cm. Calculate the number of tube rows NL in the flow direction needed to achieve the indicated temperature rise.

e- Water at 12 °C is to be heated to 60 °C by passing it over a bundle of 3-m-long, 2-cm-diameter resistance heater rods maintained at 95 °C. Water approaches the heater rod bundle in normal direction at a mean velocity of 1.2 m/s. The rods are arranged in-line with longitudinal and transverse pitches of SL = 4 cm and ST = 3 cm. Calculate the number of tube rows NL in the flow direction needed to achieve the indicated temperature rise.

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

See similar textbooks

Similar questions

Only handwritten or I'll dislike sure handwritten
What is a sharp-crested weir? On what basis are the sharp-crested weirs classified?
Question- In a laminar flow between two parallel plates with a separation distance of 6 mm, the centre line velocity is 1.8 m/s. The velocity (in m/s) at a distance of 1 mm from the Boundary is
Water at 15°C is flowing through a 10 cm cast iron pipe (ɛ=0.26 mm) at 1 L/s. The friction coefficient O a. Is a function of Reynolds number alone b. Is a function of relative roughness alone O c. Is a function of Reynolds number and relative roughness O d. Is independent of the roughness coefficient
Prob. 10 Calculate thermal entrance length for laminer flow of air with a mean velocity of 1 m/s in a pipe of 3 cm diameter. Air: v =1.86x10m?/s Pr = 0.714
Q3- Consider a fluid flow in round tube of length 1m and diameter 5mm. Classify the flow as laminar and turbulent and calculate the entrance length for (a) air (50 °C) with a speed of 12 m/s. (b) water (17.5°C) and mass flow rate of 8 g/s. (Vair = 1.79x105 m²/s and water 1.14x10-5 N.s/m²).
We derived the continuity equation in two ways: by using the divergence theorem and by summing mass flow rates through each face of an infinitesimal control volume. Explain why the former is so much less involved than the latter.
A square duct having D=23-cm and surface temperature T=70°C is located horizontally in an attic space with ambient temperature T=11°C. If the duct is subjected to ait flow of U=1.4-m/s, find the Nusselt number for the external flow over the duct as shown in the figure below. U air T
A square duct having D=17-cm and surface temperature T=66°C is located horizontally in an attic space with ambient temperature T=14°C. If the duct is subjected to ait flow of U=1.0-m/s, find the Nusselt number for the external flow over the duct as shown in the figure below. U air T,
8- Air (p = 1.21 kg/m') flows over a thin flat plate 1 m long and 0.3 m wide. The flow is uniform at the leading edge of the plate. Assume the velocity profile in the boundary layer is linear, and the free stream velocity is 2.7 m/s. Using control volume (abcd) shown in figure, compute the mass flow rate across surface (ab). Determine the magnitude and direction of the x- component of the force required to hold plate stationary. [3.9×10 kg/s ; -3.5x10 N]