![subject](/tpl/images/cats/fizika.png)
A) Consider a heated sphere at 127oC. Using 27oC air as the ambient fluid plot the convection coefficient of heat transfer, h, due to free convection as a function of the diameter (for 0.1 mm < D < 100. mm). Use log-log plot. include typed derivation and show all units.
B) Consider a heated sphere of diameter D = 1.0 cm and emissivity = 0.8 at Ts (in oC) in an ideal gas with surroundings at 27oC. On a single plot:
a. Plot the heat transfer (in Watts) due to free convection for 30oC < Ts < 400oC. b. Plot the heat transfer (in Watts) due to radiation for 30oC < Ts < 400oC. c. Plot the combined heat transfer (in Watts) for 30oC < Ts < 400oC. Use the following fluid properties (assumed to be constant): k = 0.0263 W/(m oC), = 15.9 x 10-6 m2/s and Pr = 0.71.
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 21.06.2019 19:30
Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 15:10
An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 19:00
What is the gravitational attraction between a dating couple whose centers of mass are 0.630 m apart if the boy weighs 715 n and the girl weighs 465 n?
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 23.06.2019 00:50
Aforce of 8,480 n is applied to a cart to accelerate it at a rate of 26.5 m/s2. what is the mass of the cart? 865 kg 320 kg 12.1 kg 3.12 kg
Answers: 1
You know the right answer?
A) Consider a heated sphere at 127oC. Using 27oC air as the ambient fluid plot the convection coeffi...
Questions
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/health.png)
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 19.03.2021 15:50
![question](/tpl/images/cats/User.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 19.03.2021 15:50
![question](/tpl/images/cats/mat.png)
Mathematics, 19.03.2021 15:50
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 19.03.2021 15:50
![question](/tpl/images/cats/biologiya.png)
Biology, 19.03.2021 15:50
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 19.03.2021 15:50
![question](/tpl/images/cats/mat.png)
Mathematics, 19.03.2021 15:50
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/ekonomika.png)