Homework Answers
Add Answer to:
1. A plate is placed in a large vacuum chamber to control its cooling rate. To...
A plate is placed in a large vacuum chamber to control its cooling rate. To prevent...
A plate is placed in a large vacuum chamber to control its cooling rate. To prevent cracking, the temperature gradient in the plate cannot exceed 15 K/mm at any point during cooling. The plate is initially at 900 K with an emissivity of 0.8 and thermal conductivity of 1.5 W/m.K. Assume that one of the surface of the plate is insulated and the other is exposed to the chamber, and the chamber walls are considered as black surface. Apply the...
Clear handwriting plz 1. A plate is placed in a large vacuum chamber to control its...
Clear handwriting plz
1. A plate is placed in a large vacuum chamber to control its cooling rate. To prevent cracking, the temperature gradient in the plate cannot exceed 15 K/mm at any point during cooling. The plate is initially at 900 K with an emissivity of 0.8 and thermal conductivity of 1.5 W/mK. Assume that one of the surface of the plate is insulated and the other is exposed to the chamber, and the chamber walls are considered as...
During its manufacture, plate glass at 600°C is cooled by passing air over its surface such...
During its manufacture, plate glass at 600°C is cooled by passing air over its surface such that the convection heat transfer coefficient is h. To prevent cracking, it is known that the temperature gradient must not exceed 15 °C/mm at any point in the glass during the cooling process. The thermal conductivity of the glass is 1.4 W/mK and its surface emissivity is 0.75. The temperature of the air that is used for the cooling is 315 °C. Assume that...
A 50 mm thick steel plate (AISI347) has a uniform heat flux applied to its bottom...
A 50 mm thick steel plate (AISI347) has a uniform heat flux
applied to its bottom surface by a heater. The heater is in contact
with the steel plate, and the interface between the heater and
steel has a contact resistance of 2.0 x 10-4
m2*K/W. The top surface of the plate is exposed to
surrounding air (T = 20oC, h = 10 W/m2*K) and
exchanges radiation with surroundings at Tsur =
10oC. The emissivity of the plate is 0.85....
During a cooling process of a stainless steel plate, water at 30°C flows over this plate...
During a cooling process of a stainless steel plate, water at 30°C flows over this plate at a velocity of 0.02 m/s. The stainless steel plate (k=19 W/mK) has 1.15 meter long in the flow direction) and the plate width is 0.7 meter. The plate has a uniform surface temperature of 70°C. Determine, 1. The average friction coefficient 2. The total drag force due to friction (N) 3. The average convection heat transfer 2. coefficient (W/m K) 4. The steady...
The heat question and would like to have work solution. The answers are (c) 136.6 (d)...
The heat question and would like to have work solution. The
answers are (c) 136.6 (d) < 2%. thank you.
An long cylindrical vaccuum chamber shown in Figure 1, is used to anneal single titanium rods by maintaining their temperature at 800 °C for an extended period of time. Heat is introduced into the rods internally by induction. The insulation surrounding the chamber has a thicknesss of 50 mm and thermal conductivity of 0.1 W/m.K. The convective heat transfer coefficient...
1. A thin plate walls are exposed to constant temperatures T1 and T2 as shown in...
1. A thin plate walls are exposed to constant temperatures T1 and T2 as shown in the figure. If the temperature distribution within the plate is given by the equation; d2T dr2 = 0 LLL 1.1 Derive an expression for the temperature distribution within the plate. 1.2 If T1 = 100 °C, T2 = 60 °C, find the mid plane temperature 1.3 If the heat flux crossing each surface is 400 W/m2, determine the thermal conductivity (k) of the plate...
1. one wall is formed by two materials, the first one is 15cm thick and has...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
1)Based on the latest restriction of the MCO regulations due to COVID-19, you may need to...
1)Based on the latest restriction of the MCO regulations due to COVID-19, you may need to stay at home to save your life from any diseases. Based on this; you may need to isolate your room using suitable insulation form the appendices of Fundamental of Heat and Mass Transfer textbook that could help you to reject the heat to the outdoor environment to save the energy consumption. (a) Select the suitable insulation to save the energy, providing the reason of...
A plate is placed in a large vacuum chamber to control its cooling rate. To prevent cracking, the temperature gradient in the plate cannot exceed 15 K/mm at any point during cooling. The plate is initially at 900 K with an emissivity of 0.8 and thermal conductivity of 1.5 W/m.K. Assume that one of the surface of the plate is insulated and the other is exposed to the chamber, and the chamber walls are considered as black surface. Apply the...
Clear handwriting plz
1. A plate is placed in a large vacuum chamber to control its cooling rate. To prevent cracking, the temperature gradient in the plate cannot exceed 15 K/mm at any point during cooling. The plate is initially at 900 K with an emissivity of 0.8 and thermal conductivity of 1.5 W/mK. Assume that one of the surface of the plate is insulated and the other is exposed to the chamber, and the chamber walls are considered as...
During its manufacture, plate glass at 600°C is cooled by passing air over its surface such that the convection heat transfer coefficient is h. To prevent cracking, it is known that the temperature gradient must not exceed 15 °C/mm at any point in the glass during the cooling process. The thermal conductivity of the glass is 1.4 W/mK and its surface emissivity is 0.75. The temperature of the air that is used for the cooling is 315 °C. Assume that...
A 50 mm thick steel plate (AISI347) has a uniform heat flux
applied to its bottom surface by a heater. The heater is in contact
with the steel plate, and the interface between the heater and
steel has a contact resistance of 2.0 x 10-4
m2*K/W. The top surface of the plate is exposed to
surrounding air (T = 20oC, h = 10 W/m2*K) and
exchanges radiation with surroundings at Tsur =
10oC. The emissivity of the plate is 0.85....
During a cooling process of a stainless steel plate, water at 30°C flows over this plate at a velocity of 0.02 m/s. The stainless steel plate (k=19 W/mK) has 1.15 meter long in the flow direction) and the plate width is 0.7 meter. The plate has a uniform surface temperature of 70°C. Determine, 1. The average friction coefficient 2. The total drag force due to friction (N) 3. The average convection heat transfer 2. coefficient (W/m K) 4. The steady...
The heat question and would like to have work solution. The
answers are (c) 136.6 (d) < 2%. thank you.
An long cylindrical vaccuum chamber shown in Figure 1, is used to anneal single titanium rods by maintaining their temperature at 800 °C for an extended period of time. Heat is introduced into the rods internally by induction. The insulation surrounding the chamber has a thicknesss of 50 mm and thermal conductivity of 0.1 W/m.K. The convective heat transfer coefficient...
1. A thin plate walls are exposed to constant temperatures T1 and T2 as shown in the figure. If the temperature distribution within the plate is given by the equation; d2T dr2 = 0 LLL 1.1 Derive an expression for the temperature distribution within the plate. 1.2 If T1 = 100 °C, T2 = 60 °C, find the mid plane temperature 1.3 If the heat flux crossing each surface is 400 W/m2, determine the thermal conductivity (k) of the plate...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
Most questions answered within 3 hours.
-
Why would natural selection not minimize costs (in the form of
symptoms) of evolved defenses? (choose...
asked 1 minute ago -
What is true about a critical task?
Latest finish time - latest start time = 0...
asked 4 minutes ago -
A company uses a
process costing system. Its Assembly Department's beginning
inventory consisted of 56,800 units,...
asked 3 minutes ago -
a
sealed glass cylinder contains 325 g of N2 gas at 1.02 atm at 20 c....
asked 8 minutes ago -
The main difference between an equity and a nonequity alliance
is that
A
equity alliances are...
asked 6 minutes ago -
Need help with this, in JAVA, using netbeans. A
complete response will receive a positive comment...
asked 15 minutes ago -
An imprest petty cash fund of $600 was established for minor
disbursements. At the end of...
asked 20 minutes ago -
Sharpe Cutter is a small company that produces specialty knives
for paper cutting machinery. The annual...
asked 24 minutes ago -
Calculating the Ka of a weak acid from
pH:
The pH of a 0.68M solution of...
asked 25 minutes ago -
1.What process is pushing back against gravity in the very
center (the core) of sun-like stars?...
asked 45 minutes ago -
This question is from the textbook "Python for ArcGIS" by Laura
Tateosian:
Write a script "triangles.py"...
asked 43 minutes ago -
Which of the following is an impediment that makes it
difficult for firms to achieve the...
asked 45 minutes ago