Heat transfer. Show all steps for solution 1. Consider an object of characteristic length 0.01 m and a situation for which the temperaturedifference is 30°C. Evaluating thermophysical properties at the prescribed conditions, determinethe Rayleigh number for the following fluids: (a) air at 1 atm and 100°C, (b) hydrogen at 1 atm and100°C, (c) glycerin at 0°C, and (d) water at 25°C.Consider a vertical single pane window of width - boight - 1 m. The interior surface is ovnosed to.

solution of the given problem is given below :Explanation:Step 1:Step 2: Step 3: Step 4:

Answered: 1. Consider an object of characteristic…

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.67P

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A food product with 73% moisture content in a 10 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -1.75 ° C. After 15 hours in the freezing medium -25 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = Answer W / (m² K).
A food product with 73% moisture content in a 10 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -2.25 ° C. After 15 hours in the freezing medium -35 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = .... W / (m² K).
EXTERNAL FORCED CONVECTION A 10-cm-diameter, 30-cm-high cylindrical bottle contains cold water at 38°C. The bottle is placed in windy air at 27°C. The water temperature is measured to be 11°C after 45 min of cooling. Disregarding radiation effects and heat transfer from the top and bottom surfaces, estimate the average wind velocity. Please, I need the solution from fundamental concepts of how the heat flow behaves in the system. That it be answered with theory of the subject
Partially-frozen ice cream is being placed in a package before completion of the freezing process. The package has dimensions of 8 cm by 10 cm by 20 cm and is placed in air- blast freezing with convective heat coefficient of 50 W/(m2 K) for freezing. The product temperature is -5°C when placed in the package, and the air temperature is -25°C. The product density is 700 kg/m3, the thermal conductivity (frozen) is 1.2 W/(m K), and the specific heat of the frozen product is 1.9 kJ/(kg K). If the latent heat to be removed during blast freezing is 100 kJ/kg, estimate the freezing time.
An electrically heated plate 15cm high and 10cm wide is maintained at140°C. Estimate the rate of heat dissipation from both sides of the plate in an atmospheric at 20°C, if the radiation heat transfer co-efficient is 8.72W / m² – K. For air at the mean temperature of 80°C; Take kinematic viscosity= 21.09x10 m² /s, Pr 0.692, and k = 0.0305 W/m-K.
Number 3 A food product with 80% moisture content in a 7 cm diameter can wants to be frozen. The density of the product is 1000 kg/m³, the thermal conductivity is 1.0 W/(m²K), and the initial freezing temperature is -1.75°C. After 8 hours in the freezing medium -25°C, the product temperature becomes -10°C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h= answer in W/(m²K)
8 mm diameter carbon steel (ρ = 7833 kg / m3, k = 54 W / (m K), Cp = 0.466 kJ / (kg K)) ball-shaped balls at 35°C with a temperature of 900°C for annealing heat treatment put in the oven. During this heating process, the coefficient of convection is 40 W / (m2K). The balls are wanted to be brought to a temperature of about 900°C in this oven. When the balls reach 899°C, the heating process is considered sufficient and taken from the oven. a) Find the time required for the balls to reach 899°C. b) After the balls are taken out of the oven, they are left in the ambient temperature and cooled to 100°C. Find the heat released by a ball during this cooling process.
Air at 24°C is blown over a hot pipe with a surface area of 2.94 m2 to dissipate 924 W of heat energy. What is the minimum convection heat transfer coefficient that will ensure that the temperature of the pipe surface is less than 45°C [round your final answer to two decimal places]?
Write a question about the amount heat carried away by convection after you have taken X= 14 breaths on a cold day. Feel free to look up reasonable estimates of temperature, the heat capacity of air, and lung capacity. Show work please and thank you in advance
A 200mm diameter spherical steel ball initially at 500°C is rapidly immersed in an oil bath that is at 20°C. The convection coefficient is h = 600W/m²-K, and the steel ball has the following properties: c= 500J/kg-K, p= 7000kg/m³, k=30W/m-K. Determine the time taken (min) for temperature at the surface of the ball to drop to 100°C.
If forced convection uses Reynolds number to account for fluid movement during forced convection, what dimensionless number is used for natural convection?
7. Air at 600 K, 1 atm is flowing across a flat plate kept at 300 K with a convection coefficient of 91 W/m2 K. If the Stanton number at this condition of flow is 0.039. what is the velocity of the air? Express your answer in m/s.

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