Parvinbhai 4- In a gas-fired boiler, water is being boiled at 120°C by hot air flowing through a 6-m-long, 5-cm-diameter tube submerged in water. Hot air enters the tube at 1 atm and 350°℃ at a meanvelocity of 7.5 m/s, and leaves at 150°C. If the surface temperature of the tube is 120°C,determine the average convection heat transfer coefficient of the air and the rate of waterevaporation, in kg/h.Tip: To find the density of air, use the bulk mean temperature. Find hfg of water and theenthalpy of air at the inlet and exit from thermodynamic tables.BoilerWaterVentrimaHot air||||120°C

The properties of the air at 1 atm pressure and 300 oC temperature,The mass flow rate of air in the…

Answered: In a gas-fired boiler, water is bein…

Engineering

Mechanical Engineering

In a gas-fired boiler, water is bein cm-diameter tube submerged in velocity of 7.5 m/s, and leaves determine the ou 200

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

Related questions

Q: A horizontal bar is attached to a wall. When a force of 1 kN is applied at point A (figure 1) , the…

Q: QUESTION 1 In an arc welding operation, a groove weld has a cross sectional area=0.055 in2 and is 24…

Q: 1. For the simply supported beam with a T-shape cross-section as shown below, a- Draw the shear and…

A: (a)Maximum Bending Moment =

Q: Question 1: Gasoline flows into the tank through two pipes. At A the velocity is 4 m/s. Determine…

A: The inlet velocity at pipe A is,The diameter at pipe A is,The diameter at pipe B is,The range of…

Q: If I have a cylindrical plug of sandstone 1 m long with a diameter of 3 cm, and with permeability…

A: To determine:the rate needed for the flow to atmospheric pressure.Given:The length of the plug is…

Q: 10. A compound tube is formed by shrinking together two tubes with common radius 150 mm and…

A: Following data is provided in the problem

Q: Rollers Model for a paper feeder in copy machine: 12cm 77 Simplified: Xp Friction, Vp 12cm 77 Xp xf…

A: The objective of the question is to determine the transfer function for the displacement of the…

Q: How does microchip design differ from microchip fabrication, and what tools and software are…

A: There are two separate stages in the process of making integrated circuits, or microchips: microchip…

Q: Sealed inside a rigid, poorly insulated vessel is 3 m^3 of diatomic nitrogen. The system is at 1…

A: To Find:the time interval in hours before the vessel ruptures.Given:The initial volume of nitrogen…

Q: 4-59. The post is made from 6061-T6 aluminum and has a diameter of 50 mm. It is fixed supported at A…

A: The data given is,Load, P = 50 kNModulus of elasticity, The diameter of the rod, d = 50 mmTo…

Q: The collar C in Fig. 16-16a is moving downward with a velocity of 2 m/s. Determine the angular…

A: The collar C in Fig. 16-16a is moving downward with a velocity of 2 m/s. Determine the angular…

Q: Problem 5.110 An elbow for the duct of a ventilating system is made of sheet metal of uniform…

A: Given:This problem can be solved by dividing the given geometry into different sections and then…

Q: ?For what value M of the clockwise couple will the horizontal component Ax of the pin reaction at A…

A: Find out dataa) What is the value of M if the horizontal component pin reaction at A is zerob) What…

Q: Consider the amusement-park ride in (Eigure 1). It is observed that the cables are directed at 30°…

A: Mass, m= 500 kgL= 8 mIt is observed that the cables are directed at 30 degrees from the vertical

Q: The gear ratio shown must transmit 10 horsepower (66000 lb in/s) from its input, which is rotating…

A: For the solution refer below images.

Q: Assume that the displacement angle of the pendulums shown in Fig. 1 are small enough that the spring…

A: The pendulum given in the question is a double pendulum.The stiffness of the spring is . The angle…

Q: .) Sketch the appriopriate auxillliary view for the part given below. F

A: Making a two-dimensional representation of a three-dimensional object is the process of constructing…

Q: Required information Consider the given state of stress. Take A = 16 MPa and B= 60 MPa. B 4 60 MPa…

A: The values are

Q: 1A. The wavefront of a light ray travelling through three mediums and two interfaces are giver…

A: According to Snell's Law: wheren1 and n2 are the refractive indices of the two mediumsθ1 and θ2 are…

Q: A bicycle tire has a pressure of 9.41 x 105 N/m² at a temperature of 20.2°C and contains 1.92 L of…

A: Given data:To find:The final pressure of tire.

Q: Draw the shear diagram for the cantilever beam. B) Draw the moment diagram for the cantilever…

Q: Problem 2. (a) Calculate the fraction of atom sites that are vacant for copper (Cu) at its melting…

A: To determine:a)Fraction of atom sites that are vacant for cu at its melting pointb)Fraction of atom…

Q: Calculate the magnitude of the horizontal force P, acting as shown, that will cause motion to impend…

A: Calculate the magnitude of the horizontal force P, acting as shown, that will cause motion to impend…

Q: The T shaped plate is rotating at a rate of w = 10 rad/s CCW (as shown) and deccelerating at a rate…

A: Given:The plate rotates at a rate of .The deaccelerating rate is .The dimension of plate is and…

Q: Example 3: A pipe 50 cm in diameter carries water (10 °C) at a rate of 0.5 m³/s. A pump in the pipe…

A: The diameter of the pipe, (D)=0.5 mThe volume flow rate of the water, (Q)=0.5 m3/sThe elevation at…

Q: PROBLEM: 2 1.5ft 3 ft .2 ft 3 Ft-

Q: The state of plane strain on a differential element of material is shown below. The strains are €…

Q: Determine the y_bar coordinate of the composite shape. Treat the bent corners as square and ignore…

Q: A horizontal pipe line conveys a constant rate of flow which is measured by a venturimeter located…

A: When the manometer in inclined upward in the direction of flow,the deflection on a differential…

Q: Glycerin (cp=2400J/kgK) at 20oC and 0.5kg/s is heated by ethylene glycol (cp=2500J/kgK at 50oC at…

A: The specific heat of glycerin is .The mass flow rate of glycerin is .The specific heat of ethylene…

Q: A round shaft supports a transverse load of F= 15,000 lbf and carries a torque of T = 7 kip-in, as…

Q: 20. = 3,500 mm, w = 0.5 m A = 2 cm²

Q: 7-P7. Rod AB is pin connected to a collar at A and rests against a small roller at C. (a) Neglecting…

Q: Arm AB has a constant angular velocity of 14 rad/s counterclockwise. At the instan when = 90°,…

A: The angular velocity of AB is The angle is

Q: One Ibmol of pentane gas (C3H12) reacts with the theoretical amount of air in a closed, rigid tank.…

Q: is held in the 90° open position by the single prop CD. Determine the force F in the prop and the he…

Q: A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the…

Q: A hospital must order the drug Porapill from the manufacturer of the drug. It costs $500 to place an…

A: To determine:a) What (R, Q) policy should the company use if it wants to meet 95% of all customer…

Q: 4.7* Near to the point where I am standing on the surface of Planet X, the gravitational force on a…

A: To solve this problem, let's break it down step by step.(a) Work done by gravity:The work done by…

Q: Define the term "metrology" and explain its significance in mechanical engineering. Illustrate your…

A: Metrology is the science of measurement that includes all theoretical and practical aspects of…

Q: A sign hangs from a rod as shown in the figure. The rod is attached to a wall with a frictionless…

A: Weight of rod (R) = 20 NWeight of sign (S) = 125 N

Q: Where is the Shear Force equal to zero,

A: W is the equivalent load of distributed load in region CD which acts at CD/2=4/2=2 m from point…

Q: 2. Draw the shear and moment diagrams for the beam.

Q: Determine the magnitude of the counterweight W for which the maximum absolute value of the bending…

Q: Problem 98. The drive mechanism imparts to the semicircular plate simple harmonic motion of the form…

A: Simple harmonic motion,

Q: Q6. The natural frequency of a spring-mass system is found to be 2 Hz. When an additional massof 1…

A: A spring mass system given if mass m and spring constant k Natural frequency = 2 HzIf mass m+1 and…

Q: Find the resultant force. What angle does it make with East ? 25 N due North ; 10 N North-East ; 15…

A: Find the resultant force. What angle does it make with East ?25 N due North ;10 N North-East ;15 N…

Q: Two forces act on the hook. (Figure 1) Figure 1 of 1 40° 30° F₁ Part A Determine the magnitude of…

A: The magnitude of forces are: Steps to be followed to determine the resultant force:Determine the…

Q: The 3.55 kg collar shown below is attached to a spring and released from rest at A. The collar then…

A: The spring constant is The mass of collar is .The distance is The collar is released from rest.

Q: ! Required information A piston-cylinder device contains 0.66 kg of steam at 300°C and 0.5 MPa.…

A: Here we will use the steam table to infer the values.

Concept explainers

Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.

Question

Parvinbhai

4- In a gas-fired boiler, water is being boiled at 120°C by hot air flowing through a 6-m-long, 5-
cm-diameter tube submerged in water. Hot air enters the tube at 1 atm and 350°℃ at a mean
velocity of 7.5 m/s, and leaves at 150°C. If the surface temperature of the tube is 120°C,
determine the average convection heat transfer coefficient of the air and the rate of water
evaporation, in kg/h.
Tip: To find the density of air, use the bulk mean temperature. Find hfg of water and the
enthalpy of air at the inlet and exit from thermodynamic tables.
Boiler
Water
Vent
rima
Hot air
||
||
120°C

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Step 1: Write the given data-

VIEW

Step 2: Determine the value of heat

VIEW

Step 3: Determine the value of heat transfer coefficients-

VIEW

Step 4: Determine the value of mass flow rate-

VIEW

Solution

VIEW

Step by step

Solved in 5 steps with 8 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

Steam at 40°C condenses on the outside of a 5-m-long, 3-cm-diameter thin horizontal copper tube by cooling water that enters the tube at 25°C at an average velocity of 2 m/s and leaves at 35°C. Determine the rate of condensation of steam.
Liquid water flows in a thin-walled circular tube at a mass flow rate of 11 g/s. The water enters the tube at 60°C, where it is heated at a rate of 3.8 kW. The tube is circular with a length of 2.5 m and an inner diameter of 25 mm. The tube surface is maintained at a constant temperature. At the tube exit, a hydrogenated nitrile rubber (HNBR) o-ring is attached to the tube's outer surface. The maximum temperature permitted for the o-ring is 150°C. Is the HNBR o-ring suitable for this operation? The fluid properties at 100°C are cp= 4217 J/kg-K, k= 0.679 W/m-K, µ = 0.282 × 103 kg/m.s, and Pr = 1.75. Is this a reasonable temperature at which to evaluate the fluid properties?
Liquid water flows in a thin-walled circular tube at a mass flow rate of 11 g/s. The water enters the tube at 60°C, where it is heated at a rate of 3.8 kW. The tube is circular with a length of 2.5 m and an inner diameter of 25 mm. The tube surface is maintained at a constant temperature. At the tube exit, a hydrogenated nitrile rubber (HNBR) o-ring is attached to the tube’s outer surface. The maximum temperature permitted for the o-ring is 150°C. Is the HNBR o-ring suitable for this operation? The fluid properties at 100°C are cp = 4217 J/kg∙K, k = 0.679 W/m∙K, μ = 0.282 × 10−3 kg/m∙s, and Pr = 1.75. Is this a reasonable temperature at which to evaluate the fluid properties? The surface temperature of the tube is?
Consider a pipe with a length of 25 m and diameter of 5 cm. The surface temperature of the pipe is constant at 150°C.Oil at 20°C is passing though this pipe with a mass flow rate of 0.5 kg/s. determine (a) the temperature of the oil at the exit and (b) the total heat transfer rate. Note. Report your solution step by step and clearly.
Inside a condenser, there is a bank of seven copper tubes with cooling water flowing in them. Steam condenses at a rate of 0.5 kg/s on the outer surfaces of the tubes that are at a constant temperature of 70°C. Each copper tube is 6-m long and has an inner diameter of 20 mm. Cooling water (Cp=4120 J/kgK) enters each tube at 5°C and exits at 60°C. Determine the average heat transfer coefficient of the cooling water flowing inside each tube and the cooling water mean velocity needed to achieve the indicated heat .transfer rate in the condenser Steam Cooling water flow
3. Consider a 10-m-long smooth rectangular tube, with a =50 mm and b =25 mm, that is maintained at a constant surface temperature. Liquid water enters the tube at 20°C with a mass flow rate of 0.01 kg/s. Determine the tube surface temperature necessary to heat the water to the desired outlet temperature of 80°C.
Liquid glycerin is flowing through a 25-mm-diameter and 10-m-long tube. The liquid glycerin enters the tube at 10°C with a mass flow rate of 0,2 kg/s. If the outlet mean temperature is 60°C and the tube surface temperature is constant, determine the surface temperature of the tube.
Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cm-ID tube whose surface is maintained at 620 K. What length of tube is required?
One house owner with a pond on his property has decided to use the pond water to cool his house. His idea is to flow air through a thin smooth 10-cm-diameter copper tube that could be submerged into the pond. The water in the pond, at few meters below the surface is typically maintained at a constant temperature of 15°C. If he assumes the air (~1 atm) entering the copper tube at a mean temperature of 30°C with an average velocity of 2.5 m/s, determine the necessary copper tube length that would be needed so that the outlet mean temperature of the air is 20°C. You may consider the convection heat transfer coefficient of 1000 W/m2·K on the outer surface of the copper tube, between the pond water and copper tube. Since the copper tube is thin, the conduction resistance of the tube wall may be neglected.
Saturated steam at 1 atm is condensed on the external surface of a copper tube with an outside diameter 16 mm and tube wall of thickness 0.5 mm. The tube is cooled internally by water with a mass flow rate of 0.06 kg/s, which in turn is raised in temperature from 15 °C to 60 °C as it flows through the tube. Take the heat-transfer coefficient at the condensing side as 10.0 kW/m² K and the isobaric specific heat-capacity of water as 4180 J/kg K. i) Calculate the heat transfer rate to the cooling water. ii) iii) Calculate the length of the tube. Comment on how to enhance heat transfer in this case.
In a manufacturing plant that produces cosmetic products, glycerin is being heated by flowing through a 25-mm-diameter and 10-m-long tube. With a mass flow rate of 0.5 kg/s, the flow of glycerin enters the tube at 25°C. The tube surface is maintained at a constant surface temperature of 140°C. Determine the outlet mean temperature and the total rate of heat transfer for the tube. Evaluate the properties for glycerin at 30°C.
In a gas-fired boiler, water is being boiled at 120°C by hot air flowing through a 5-m-long, 5-cm-diameter tube submerged in water. Hot air enters the tube at 1 atm and 300°C at a mean velocity of 7 m/s and leaves at 150°C. If the surface temperature of the tube is 120°C, determine the average convection heat transfer coefficient of the air and the rate of water evaporation, in kg/h.