a) Derive an expression for turbulent boundary layer thickness over a flat plate. b) The flow rates of hot and cold water streams running through a parallel flow heat exchanger are 0.2 kg/s and 0.5 kg/s respectively. The inlet temperatures on the hot and cold sides are 75°C and 25°C respectively. The exit temperature of hot water is 45°C. If the individual heat transfer coefficients on both sides are 650 W/m°C, calculate the area of the heat exchanger.

a) Derive an expression for turbulent boundary layer thickness over a flat plate. b) The flow rates of hot and cold water streams running through a parallel flow heat exchanger are 0.2 kg/s and 0.5 kg/s respectively. The inlet temperatures on the hot and cold sides are 75°C and 25°C respectively. The exit temperature of hot water is 45°C. If the individual heat transfer coefficients on both sides are 650 W/m°C, calculate the area of the heat exchanger.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.46P

See similar textbooks

Related questions

Q: The local heat transfer coefficient of a flat plate that is obtained experimentally is equal to…

A: Given heat transfer coefficient hx=9x2+2ax+B Length of plate L=7 m Temperature of plate T=20∘C…

Q: In a parallel-flow heat exchanger, air (c,=1 kJ/kgk) is heated from 15 °C to 85 °C by water (c,=4…

Q: An air-to-air heat recovery unit uses across-flow exchanger with both fluids unmixed and an airflow…

A: Write the given data. m˙h=m˙c=0.5 kg/sThi=400 °CTci=20 °CU=40 W/m2°CA=15 m2ch=cc=1006 J/kg°C

Q: Consider a heat exchanger made of sheets of parallel flat plates. Water at 25 C, 1 atm, and 4 m/s…

A: Write the expression of flow rate. Q=112μ∂P∂xb4

Q: Estimate the heat exchanger area needed to cool 55,000 lb/hr of a light oil (specific heat = 0.74…

A: “Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: Consider a heat exchanger made of thin copper tubes. Fins are attached to the outer surface of the…

Q: Water enters a crossflow exchanger (with both fluids unmixed) at 16◦C and flows at 7.5 kg/s. It is…

A: Disclaimer: “Since you have posted a question with multiple sub-parts, we will solve the first three…

Q: Q1: Air at 300 K and 50 kPa flows over a 2-m-square plate at a velocity of 70 m/s. The plate is…

Q: - In a heat exchanger, steam of 0.08 bar and a specific steam content of 95% is condensed. 381.6…

A: a.

Q: Air enters a duct (100 cm *10 cm*10 cm) at 32°C at a rate of 0.28 m³/min to cool 138 W electronic…

Q: Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The…

A: Given data: The inner pipe wall temperature is Ti=110°C The internal diameter of the pipe is d=35…

Q: A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from…

Q: counterflow heat exchange designed to cool 1.2 kg/sec of oil with specific heat Cp = 4.4 kj/kg-k…

Q: 5) During an experiment, a plate heat exchanger that is used to transfer heat from a hot-water…

Q: Hot exhaust gases are used in a finned-tube cross-flow heat exchanger to heat 2.5 kg/s of water from…

A: Given: The inlet temperature of water is Tc1=35°C. The outlet temperature of water is Tc2=85°C. The…

Q: Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The…

A: Solving part a,b and c If want any specified question to be solved pls repost the question with…

Q: An 8-m-long, uninsulated square duct of cross section 0.2 m x 0.2 m and relative roughness 10³…

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: Cold water (C, = 4180 J/kg.°C) enters the tubes of a heat exchanger with 2-shell passes and 20 tube…

Q: A 12-m-long countercurrent-flow heat exchanger is being used to heat a liquid food from 20 to 90°C.…

A: Given : L = 12 m cooling medium Tci = 20o C Tco = 90o C Cc = 4 kJ/kg oC heating medium Thi =…

Q: 5. Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at…

A: To Find : The required gas side surface area. Given : The inlet temperature of gas is Ti,g=300°C.…

Q: A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from…

Q: The local heat transfer coefficient of a flat plate that is obtained experimentally is equal to…

A: Given:hx=9x2+2ax+Ba=4 W/m3.KB=10 w/m2.KL=4 mTp=20°CT∞=10°C

Q: A counterflow heat exchanger is designed to cool 0.65 kg/sec of oil with specific heat Cp=3.4…

A: Given: Let us consider the given data, For oil, m˙h=0.65 kgsCph=3.4 KJkg-Kth1=150°Cth2=70°C For…

Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

Question No.15: a) Derive an expression for turbulent boundary layer thickness over a flat plate. b) The flow rates of hot and cold water streams running through a parallel flow heat exchanger are 0.2 kg/s and 0.5 kg/s respectively. The inlet temperatures on the hot and cold sides are 75°C and 25°C respectively. The exit temperature of hot water is 45°C. If the individual heat transfer coefficients on both sides are 650 W/m°C, calculate the area of the heat exchanger.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The internal diameter of the pipe is 40 mm. Product flows at 0.5 kg / s. If the initial temperature of the product is 7 ° C, calculate the convective heat transfer coefficient. The thermal properties of the product are as follows: specific heat = 3.7 kJ / (kg ° C), thermal conductivity = 0.6 W / (m ° C), product viscosity = 500 x 10-6 Pa s, density = 1000 kg / m³ , the product viscosity at 110 ° C = 410 x 10-6 Pa s. a. Find the Reynold number = Answer . b. Find the number Prantl = Answer . c. Find the Nuselt = Answer number d. Convection coefficient = Answer W / m² ° C.
Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The internal diameter of the pipe is 35 mm. Product flows at 0.5 kg / s. If the initial temperature of the product is 7 ° C, calculate the convective heat transfer coefficient. The thermal properties of the product are as follows: specific heat = 3.7 kJ / (kg ° C), thermal conductivity = 0.6 W / (m ° C), product viscosity = 500 x 10-6 Pa s, density = 1000 kg / m³ , the product viscosity at 110 ° C = 410 x 10-6 Pa s. a. Find Reynold's number = b. Find the number Prantl = c. Find the Nuselt number = d. Convection coefficient =....... W/m² °C
Please asap
5. Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at 100 °C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C 125 °C. The specific heat of water at the average water temperature is 4197 J/kg. K. The overall heat transfer coefficient based on the gas-side surface area is Uh = 100 W/m².K. Determine the required gas-side surface area A₁ using the LMTD and & -NTU method.
Air enters a duct (100 cm *10 cm*10 cm) at 32°C at a rate of 0.28 m/min to cool 138 W electronic component placed on the duct. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the convective heat transfer coefficient (W/m2.°C), Assume fully developed flow for the whole channel length and (if flow is NOT Laminar use Dittus-Boelter equation:Nu=0.023 Re0.8Pr") E1007 J/kg.°C, v =1,654×10 m /s, p = 1.146 kg/m Pr= 0.7268, k = 0.02625 W/m. °C Select one:
5. Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at 100 °C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C 125 °C. The specific heat of water at the average water temperature is 4197 J/kg. K. The overall heat transfer coefficient based on the gas-side surface area is U₁ = 100 W/m².K. Determine the required gas-side surface area A₁ using the LMTD and & -NTU method.
Estimate the heat exchanger area needed to cool 55,000 lb/hr of a light oil (specific heat= 0.74 Btu/lb°F) from 190°F to 140°F using cooling water that is available at 50°F. Thecooling water can be allowed to heat to 90°F. An initial estimate of the Overall HeatTransfer Coefficient is 120 Btu/hr.ft².°F.  Show a schematic of the heat exchanger. Estimate the required mass flow rate of cooling water. The LMTD Taking the shell and tube heat exchanger described above how manytubes of 3 inch diameter and 10 ft length should be used?
A 12-m-long countercurrent-flow heat exchanger is being used to heat a liquid food from 20 to 90°C. The heating medium is oil, which enters the heat exchanger at 160°C and exits at 110°C. The specific heat of the liquid food is 4.0 kJ/(kg-°C). The overall heat- transfer coefficient based on the inside area is 1000 W/ (m²-°C). The inner diameter of the inside pipe is 6 cm. (a) Estimate the flow rate of the liquid food. (b) Determine the flow rate of the liquid food if the heat exchanger is operated in a concurrent-flow mode for the same conditions of temperatures at the inlet and exit from the heat exchanger.
The local heat transfer coefficient of a flat plate that is obtained experimentally is equal to 9x^2+2ax+B. If the length of the plate is equal to 7 m. Determine the value of the average heat flux between the plate at 20 Cand the air that is at 10 C.a 4w/m^3.k and B is equal to 10W/m^2.k Select one: O a. 1850 W/m^2 O b. 1980 W/m^2 O c. 1700 VW/m^2 O d. 1625 W/m^2
A counterflow heat exchanger is designed to cool 0.65 kg/sec of oil with specific heat Cp=3.4 KJ/kg-K from 150°C to 70°C. Water for cooling, Cp = 4.18KJ/kg-K is available at 20°C and flow rate of 0.6 kg/sec. Calculate the length of a 3.5 cm inside diameter tubing in meters. The overall coefficient of heat transfer is 90 W/m²-K. O 452 O 337 O 543 O 296
Consider a heat exchanger made of thin copper tubes. Fins are attached to the outer surface of the tubes. The fins are made of copper and short. Convective heat transfer coefficients on the inner and outer surface of the tubes are 550 and 50 W/m2K, respectively. Total inner and outer surface area is 2 and 15 m2, respectively. What is the overall heat transfer coefficient based on the inner surface area (W/m2K)? a. 223 b. 130.4 c. 107.1 d. 29.73 e. 1850 f. 0.0022 g. 166.7.
A food factory uses hot water to wash and clean foods. The drained water, which has a mass flow rate of 8 kg/min, still have a temperature of 45°C. Based on the knowledge delivered in ABEE3049 Chapters 7 & 8 (heat exchangers or heat pipes), consider a concept design solution of waste heat recovery for pre-heating fresh water, which has an inlet temperature of 15°C and mass flow rate of 6 kg/min. A clear justification and calculations should be included.