Steady-state temperatures at selected nodal points ofthe symmetrical section of a flow channel are knownto be
- Determine the temperatures at nodes 1, 4, 7, and 9.
- Calculate the heat rate per unit length (W/m) fromthe outer surface A to the adjacent fluid.
- Calculate the heat rate per unit length from theinner fluid to surface B.
- Verify that your results are consistent with an overallenergy balance on the channel section.
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
Introduction to Heat Transfer
- Topic: Heat transfer Completely solve and box the final answer. Water flows at 5m/s is passed through a tube of 2.5 cm diameter, it is found to be heated from 20degC to 60degC. The heating is achieved by condensing steam on the surface of the tube and subsequently the surface temperature of the tube is maintained at 90degC. Water properties are as follows: density=995kg/m3, kinematic viscosity=.657x10-6 m2/s, Pr=4.43, k=.628W/mK, cp=4178J/kgK. Determine the Reynolds number.arrow_forwardWater flows through pipe A whose diameter is 30 cm and into parallel pipes 1, 2 and 3 and out through Pipe B (diameter= 30 cm). The properties of the pipe are as follows: for pipe 1, L= 300 m, diameter = 10 cm f= 0.020; for pipe 2 L= 240 m diameter= 15 cm f= 0.018 and for pipe 3, L= 600 deiameter= 20 cm f= 0.017. The upstram junction has an Elev. 90 m with pressure of 205 kPa; the downstream junction is at Elev. 30 m. If the average velocity in pipe A is 3.0 m/s, find the flow rate in pipe 3. Provide FBD and choose the right answer below a.24.68 L/s b.212.0 L/s c.80.21 L/s d.107.11 L/s Clear my choicearrow_forwardWater flows through pipe A whose diameter is 30 cm and into parallel pipes 1, 2 and 3 and out through Pipe B (diameter= 30 cm). The properties of the pipe are as follows: for pipe 1, L= 300 m, diameter = 10 cm f= 0.020; for pipe 2 L= 240 m diameter= 15 cm f= 0.018 and for pipe 3, L= 600 deiameter= 20 cm f= 0.017. The upstram junction has an Elev. 90 m with pressure of 205 kPa; the downstream junction is at Elev. 30 m. If the average velocity in pipe A is 3.0 m/s, find the flow rate in pipe 3. include your free body diagram. a.24.68 L/s b.80.21 L/s c.107.11 L/s d.212.0 L/sarrow_forward
- (1) Given the working form of the Bernoulli equation as dW - F dm Where 3 is the friction heating per unit mass dP F = Au - dm Given also that friction heating in laminar flow of Newtonian fluids in circular pipes is given as -AP F =- = -gAz = Q Ax " 128 Ax is change in the x-direction. A typical capillary viscometer has a large-diameter reservoir and a long, small diameter, vertical tube. The sample is placed in the reservoir and the flow rate due to gravity is measured. The tube is 0.1 m long and has a 1 mm ID. The height of the fluid in the reservoir above the inlet to the tube is 0.02 m. The fluid being tested has a density of 1050 kg / m. The flow rate is 10* m³ / s. What is the viscosity of the fluid? Typical capillary viscometerarrow_forward1- Consider single-phase fluid flow in a 1-D horizontal reservoir.The reservoir is discretized using four blocks in the x-direction. A well located in block 3 produces at a rate of 400STB/D. All grid blocks have Ax-250ft, w-900ft, h-100 ft, and kx-270md. The FVF and the viscosity of the flowing fluid are 1.0 RB/STB and 2cP, respectively. Identify the interior and boundary blocks in this reservoir. Write the flow equation for block 3 and give the physical meaning of each term in the equation.arrow_forwardA circuit board is cooled by passing cool helium gaş "C,= 5193 J/kg.C, v =1.233×10 m /s, p= 0.1635 kg/m Pr = 0.669, k = 0.1565 W/m.°C " through a channel [0.46 cm x14 cm×20 cm ] drilled into the board. Helium enters at 15°C and 6.8 m/s and leaves at 63.7 °C. The heat flux at the top surface of the channel can be considered to be uniform, and heat transfer through other surfaces is negligible. Assume fully developed flow for the whole channel length and (if flow is NOT Laminar use Dittus-Boelter equation:Nu=0.023 Re Pr) What is the maximum surface temperature on the circuit board (°C)? Electronic components, T, °C Не 15°C L=20 cm Channelarrow_forward
- can i get help with all parts, thanksarrow_forwardl MTN 1/1 4:26 PM 80% An oil with density 900 kg/m3 and flow rate 0.0002 m2/s flows upward through an inclined pipe as shown in figure below, The pressure at sections 1 and 2 are P1 = 350 kPa and P2 = 250 kPa, and the elevation at section 1 z1 = 0, Sections 1 and 2 are 10 m apart (L = 10 m) and the pipe is inclined at 40°. The pipe diameter is 6 cm. Assuming steady laminar flow, (a) Verify that the flow is up, (b) Compute hr between 1 and 2, (c) What is the flow rate Q, (d) Find the flow velocity, V, (e) Verify if the flow is really laminar. Flow OR directionarrow_forwardHeat transferarrow_forward
- The velocity profile for laminar flow between two plates, as in Fig.3, is 2umaxy(h-y) h4 u= If the wall temperature is Tw at both walls, use the incompressible flow energy equation to solve for the temperature distribution T (y) between the walls for steady flow. Energy equation: dT pcp dt y=h y=0 •= kV²T +4 u(y) v=W=0 Tw T(y) Fig.3. Fluid flow between two wallsarrow_forwardFluid Mechanics:arrow_forwardD--- p, FIGURE P7-62 7–63 Consider laminar flow through a long section of pipe, as in Fig. P7–62 0. For laminar flow it turns out that wall roughness is not a relevant parameter unless e is very large. The volume flow rate b through the pipe is a function of pipe diameter D, fluid viscosity µ, and axial pressure gradient dPldx. If pipe diameter is doubled, all else being equal, by what factor will volume flow rate increase? Use dimensional analysis.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning