Homework Answers
The code
t1=[0.5 3 7 11 15];
T1=[85 48 35 33 31];
plot(t1,T1)
hold on
A=30;
B=40;
m=-0.276;
T2=@(t2) A+B*exp(m*t2);
fplot(T2,[0 15])
legend('data ponit','mathematical model')
xlabel('time')
ylabel('temp')
title('temp vs time')
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HW1_3 If a hot liquid in a container is left to cool, its temperature will gradually...
Problem 2 (30%). Liquid nitrogen is used to cool hot air exhausting from a gas turbine....
Problem 2 (30%). Liquid nitrogen is used to cool hot air exhausting from a gas turbine. The exhausted air at 200 °c (T) flows into a circular pipe of diameter D 2.54 cm and length L 5 m at a velocity V= 10 m/s. The surface of the pipe is maintained at a constant temperature, T,-- 146°C. Determine the average convective coefficient and rate of heat transfer over the entire length of the pipe.
You cool a 120.0 g slug of red-hot iron (temperature 745 ∘C) by dropping it into...
You cool a 120.0 g slug of red-hot iron (temperature 745 ∘C) by dropping it into an insulated cup of negligible mass containing 75.0 g of water at 20.0 ∘C. Assume no heat exchange with the surroundings. a) What is the final temperature of the water? T final = ? degrees C b) What is the final mass of the iron and the remaining water? m final = ? g
Radioactive decay occurs when a radioactive isotope ("parent" isotope) gradually transforms into ...
Radioactive decay occurs when a radioactive isotope ("parent" isotope) gradually transforms into a radiogenic isotope ("daughter" isotope) over time. This process is modeled by the following function: where r is the ratio of parent to daughter atoms, t is time and τΗ is called the halflife. The following table shows several parent-daughter pairs along with their half-lives. Daughter N14 Srs7 Ar4o Pb206 Pb207 Half-Life (years) 5730 48.8 x 109 1.3 x 109 4.6 x 109 0.7 x 10 arent Rbs7...
density of water is998 3. Hot alcohol from a still is cooled in a "worm" liquid-liquid...
density of water is998
3. Hot alcohol from a still is cooled in a "worm" liquid-liquid heat exchanger. The alcohol flows through a 2 cm diameter pipe at a rate of 0.5 kg/s and is cooled from 75 to 45 C. Surrounding the pipe is a water bath containing a large quantity of water to keep the outer temperature of the pipe at a constant 20 °C. Use the following properties for alcohol (ethanol): p = 770 kg/m, 5.88 x...
9) An insulated container contains V liters of hot water at temperature T. If M kg...
9) An insulated container contains V liters of hot water at temperature T. If M kg of ice at 0 °C is added to the water, what is the temperature of the system when it reaches equilibrium? Reminder, for water: 1L = 1 kg Cwater = 4190 Cice = 2100 ROK Lboll = 2.26 x 106 steam kg = 2000 .,Lmelt = 3.33 x 105 kg kg kg 10) In an engine, after the fuel is ignited, there is a...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and an outer diameter of D2 = 32 mm. The thermal conductivity of the pipe wall is 12 W/m·K. The inner surface of the pipe is coated with thin polyvinylidene chloride (PVDC) lining. Along a length of 1 m, the pipe outer surface is exposed to convection heat transfer with hot gas, at T∞ = 100°C and h = 5 W/m2·K, and thermal radiation with...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included in the mathematical model. Considering the case of the hot fluid on the outside and the colder fluid on the inside, as shown in Figure below, sketch qualitatively the change that the inclusion of this consideration will have on the temperature distribution in the heat exchanger. Also, give the energy equation taking this loss into account. Hot Cold Energy loss 2. Experiments are carried...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included in the mathematical model. Considering the case of the hot fluid on the outside and the colder fluid on the inside, as shown in Figure below, sketch qualitatively the change that the inclusion of this consideration will have on the temperature distribution in the heat exchanger. Also, give the energy equation taking this loss into account. Hot Cold Energy loss 2. Experiments are carried...
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna....
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna. The sauna is unbearably hot and a person can only stay for 20 seconds, during which the temperature reading keeps on changing and a steady temperature is not reached. Leaving the thermocouple reader in the sauna for extended period of time has been deemed too risky for an electronics device Fortunately, a transient heat transfer model can be used to extract the temperature in...
I just need the last part. T_3min HW7_3 Ball bearings are hardened through a process known...
I just need the last part. T_3min
HW7_3 Ball bearings are hardened through a process known as quenching-submersion of the heated ball bearing in oil or water in order to cool it rapidly. The data below represent the temperature of the ball at various points in the cooling process | time (sec) 0 30 | 60 | 150 | 240 Temp (C) 800 457 269 | 79 46 Plot the data, along with a) interpolating polynomial, (use polyfit and polyval)...
Problem 2 (30%). Liquid nitrogen is used to cool hot air exhausting from a gas turbine. The exhausted air at 200 °c (T) flows into a circular pipe of diameter D 2.54 cm and length L 5 m at a velocity V= 10 m/s. The surface of the pipe is maintained at a constant temperature, T,-- 146°C. Determine the average convective coefficient and rate of heat transfer over the entire length of the pipe.
Radioactive decay occurs when a radioactive isotope ("parent" isotope) gradually transforms into a radiogenic isotope ("daughter" isotope) over time. This process is modeled by the following function: where r is the ratio of parent to daughter atoms, t is time and τΗ is called the halflife. The following table shows several parent-daughter pairs along with their half-lives. Daughter N14 Srs7 Ar4o Pb206 Pb207 Half-Life (years) 5730 48.8 x 109 1.3 x 109 4.6 x 109 0.7 x 10 arent Rbs7...
density of water is998
3. Hot alcohol from a still is cooled in a "worm" liquid-liquid heat exchanger. The alcohol flows through a 2 cm diameter pipe at a rate of 0.5 kg/s and is cooled from 75 to 45 C. Surrounding the pipe is a water bath containing a large quantity of water to keep the outer temperature of the pipe at a constant 20 °C. Use the following properties for alcohol (ethanol): p = 770 kg/m, 5.88 x...
9) An insulated container contains V liters of hot water at temperature T. If M kg of ice at 0 °C is added to the water, what is the temperature of the system when it reaches equilibrium? Reminder, for water: 1L = 1 kg Cwater = 4190 Cice = 2100 ROK Lboll = 2.26 x 106 steam kg = 2000 .,Lmelt = 3.33 x 105 kg kg kg 10) In an engine, after the fuel is ignited, there is a...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included in the mathematical model. Considering the case of the hot fluid on the outside and the colder fluid on the inside, as shown in Figure below, sketch qualitatively the change that the inclusion of this consideration will have on the temperature distribution in the heat exchanger. Also, give the energy equation taking this loss into account. Hot Cold Energy loss 2. Experiments are carried...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included in the mathematical model. Considering the case of the hot fluid on the outside and the colder fluid on the inside, as shown in Figure below, sketch qualitatively the change that the inclusion of this consideration will have on the temperature distribution in the heat exchanger. Also, give the energy equation taking this loss into account. Hot Cold Energy loss 2. Experiments are carried...
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna. The sauna is unbearably hot and a person can only stay for 20 seconds, during which the temperature reading keeps on changing and a steady temperature is not reached. Leaving the thermocouple reader in the sauna for extended period of time has been deemed too risky for an electronics device Fortunately, a transient heat transfer model can be used to extract the temperature in...
I just need the last part. T_3min
HW7_3 Ball bearings are hardened through a process known as quenching-submersion of the heated ball bearing in oil or water in order to cool it rapidly. The data below represent the temperature of the ball at various points in the cooling process | time (sec) 0 30 | 60 | 150 | 240 Temp (C) 800 457 269 | 79 46 Plot the data, along with a) interpolating polynomial, (use polyfit and polyval)...
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