21.Determine the convection heat transfercoefficient for the flow of(a) fluid A and(b) fluid Bel106安苏白diameter and10-m long tube when the tube is subjected touniform heat flux from all surfaces. Use fluidproperties at 25°C.一苏白Fluid A or BD=10cmL=100mThe properties of fluid A at 25°C9500.02551W - mk-191915850EE:= 1.562 x 10 5m -s1Pr = 0.7296%3D Fluid A or BD=10cmL=100mThe properties of fluid A at 25°C are:OF106k = 0.02551W. m1. K11.562 x 10m -s191915850E106Pr = 0.7296The properties of fluid B at 25°C are1495.5kg - m 3k = 0.9105W - m.K13.4055 x 10-'m² -s1Pr = 9.21安苏白91915850E106Correlations:安苏白For laminar flow in a circular pipe: Nu = 4.365106For turbulent flow in a circular pipe:Nu0.023 Re0.8 Pr0.4%3D

Given:- D=10cm=0.1m L=100m V=2m/s T= 25°C To find: Heat transfer coefficient for: a) Fluid A b)…

21.Determine the convection heat transfer coefficient for the flow of (a) fluid A and (b) fluid B 安苏白 diameter and 10-m long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C.

21.Determine the convection heat transfer coefficient for the flow of (a) fluid A and (b) fluid B 安苏白 diameter and 10-m long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C.

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

In the last step of a food supplement production, the food supplement is heated from 25C to 75C while passing through a 12.7 mm diameter thin-walled tube at a speed of 0.2 m / s. Proper heating is provided by an electric resistance heating system wrapped on the outer surface of the pipe. What is the heat flux in a pipe with a length of 10 m? The density of the fluid is given as 1000 kg / cubic meter , heat capacity 4000 J / kg-K, density 2x10^-3 kg / m-s, heat transfer coefficient 0.8 W / m-K and Prandtl number 10.
Water is to be heated from 35 °C to 65 °C in a rough tube with a relative roughness of 0.001. The tube has an electric heater provides a constant heat flux such that the tube average wall temperature is 20 °C above the average water bulk temperature. The Reynolds number used for calculating the heat-transfer coefficient is 100,000. Calculate the length of tube required for heating, expressed in meters, if the tube has a diameter of 1 cm.
Choose the right answer 1. The mean Nusselt number for fully developed laminar flow in a circular tube under a constant heat flux a. depends on Reynolds number b. depends on Prandtl number c. is constant 2. The value of Prandtl number for air is about а. О.1 b. 0.3 с. 0.7 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Grand Pr 4. A fluid is flowing along a plate having a high uniform wall temperature. The heat transfer along the length a. decreases b. remain constant c. increases 5. For fully developed laminar flow and heat transfer in a heated long circular tube, if the flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will be a. four times of the original value before b. half of the original value с. same as d. double of the original value
Heat transfer Air flows through a smooth thin-walled rectangular duct of height, a= 0.3 m and width, b=1 m. The air is heated by the duct walls at a uniform heat flux of 250 W/m2 . At some location inside the duct, the mean velocity and temperature of air was measured to be um = 0.05 m/s and Tm = 350 K, respectively. (a) What is the hydraulic diameter of the duct? (b) What is the Reynolds number for the flow in the duct? (c) Is the flow laminar or turbulent? (d) Assuming fully developed flow, what is the heat transfer coefficient (h) at this location?
What is the Reynolds number of a fluid flowing in a tube with an inside diameter of 2 inches? The viscocity is 1.358 x 10^-5 lb/ft-s and the mass flow rate is 73 lb/h.
In the final stages of production, a pharmaceutical is sterilized by heating it from 25 to 75°C as it moves at 0.21 m/s through a straight thin-walled stainless steel tube of 12.7-mm diameter. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the tube. If the tube is 10 m long, what is the required heat flux? If fluid enters the tube with a fully developed velocity profile and a uniform temperature profile, what is the surface temperature at the tube exit? Fluid properties may be approximated as p = 1000 kg/m³, c, = 4000 J/kg-K, µ = 2x 103 kg/s-m, k = 0.8 W/m-K, and Pr = 10. Determine the required heat flux, W/m². q! = i W/m? Determine the surface temperature at the tube exit, in °C. i °C S,0
Heat Transfer Questiion is image
Q) Compare the heat transfer coefficients under the following conditions (Assume flow is turbulent). (1) Two fold increase in the diameter of the tube; the flow velocity is maintained constant by a change in the rate of liquid flow. (2) Two fold increase in the flow velocity by varying the mass flow rate. Comment on. the results.
Q2:A) Define the bulk temperature (Tn), and prove that : T₁, - 2 ur dr B) Ethylene glycol flows at 0.01 kg/s through a 3 mm diameter, thin walled_tube. The tube is coiled and submerged in a well-stirred water bath maintained at 25 °C. If the fluid enters the tube at 85 °C, what heat rate and tube length are required for the fluid to leave at 35 °C ? At 60 °C, μ = 0.00522 kg/m.s, k = 0.26 W/m.K, C, 2562 J/kg.K. -
Consider an engineer calculating the heat transfer laminar forced convection in a 2-m long rectangular tube. Flow becomes fully developed after 1 m. If the engineer uses a heat transfer coefficient for fully developed flow, the heat transfer rate calculated is
Refrigerant-134a is being transported at 0.08 kg/s through a Teflon tube of inside diameter D; = 20 mm and outside diameter Do = 25 mm, while atmospheric air at V = 28 m/s and 300 K is in cross flow over the tube. What is the heat transfer per unit length of tube, in W/m, to Refrigerant-134a at 230 K? q' = i W/m Use Hilpert correlation to estimate the external heat transfer coefficient, and please state ALL assumptions.