Convection over plate (top and bottom)

In summary, we are considering a flat plate subject to parallel flow with a flow rate of 5 m/s and a temperature of 20°C. The task is to find the average convection heat transfer coefficient and convective heat transfer rate for a 2m x 2m flat plate with an airflow and surface temperature of 50°C. To calculate the Reynold's number and convection coefficient, we use the equations ReL = V*L/v and h = Nu*k/L, with L being 2m since it is measured from one surface.
  • #1
jofree87
38
0

Homework Statement



Consider a flat plate subject to parrallel flow (top and bottom) characterized by u∞ = 5 m/s and T∞ = 20°C.

Determine the average convection heat transfer coefficient and convective heat transfer rate with an L = 2m long and w = 2m wide flat plate for airflow and surface temp Ts = 50°C

Homework Equations



ReL = V*L/v

h = Nu*k/L

The Attempt at a Solution



My question is what should the L be to calculate the Reynold's number and conventive coefficient. Is it 2m or 4m since fluid flows over the top and bottom?
 
Physics news on Phys.org
  • #2
The L is measured from one surface so L is 2 m.
 

1. What is convection over plate?

Convection over plate refers to the transfer of heat through the movement of fluid (such as air or water) over a solid surface. This process occurs due to the difference in temperature between the fluid and the surface, causing the fluid to rise and create a convection current.

2. How does convection over plate occur on the top and bottom of the plate?

On the top of the plate, convection occurs as the warmer fluid rises and moves away from the surface, while the cooler fluid sinks and takes its place. This creates a continuous cycle of heat transfer. On the bottom of the plate, the process is similar, but in the opposite direction, with the cooler fluid rising and the warmer fluid sinking.

3. What factors affect convection over plate?

The speed of the fluid, the temperature difference between the fluid and the plate, the properties of the fluid (such as density and viscosity), and the surface characteristics of the plate (such as roughness) can all affect the rate and efficiency of convection over plate.

4. How is convection over plate important in nature and industry?

Convection over plate plays a crucial role in many natural phenomena, such as wind and ocean currents, as well as in industrial processes like heat transfer in cooling systems and cooking. Understanding and controlling convection over plate can help us better predict and manage these systems.

5. Are there any limitations or drawbacks to convection over plate?

One limitation of convection over plate is that it requires a temperature difference between the fluid and the surface to occur, so it may not be effective in situations where the temperature is relatively uniform. Additionally, in some cases, convection over plate can result in uneven heat distribution, leading to potential issues in certain applications.

Similar threads

Thermodynamics Ice Melting Question
    • Introductory Physics Homework Help
Replies
4
Views
2K
What is the Correct Way to Calculate Emissivity and Absorptivity?
    • Introductory Physics Homework Help
Replies
8
Views
1K
Heat Transfer Through a Two Material System due to a Light Source
    • General Engineering
Replies
10
Views
2K
How calculate the Heat flux requiered to evaporate sub cool water
    • Introductory Physics Homework Help
Replies
1
Views
1K
Natural Convection vertical heated flat plate
    • Engineering and Comp Sci Homework Help
Replies
3
Views
1K
Heat transfer coeffcient expression
    • Introductory Physics Homework Help
Replies
3
Views
2K
What Is the Physical Interpretation of Prandtl Number in Heat Transfer?
    • Introductory Physics Homework Help
Replies
1
Views
5K
Question about Convective Heat Transfer Coefficient?
    • Introductory Physics Homework Help
Replies
4
Views
1K
Cooking (Thermodynamics) Problems
    • Introductory Physics Homework Help
Replies
14
Views
3K
External Fluid Flow -- Immersed Body Friction Drag
    • Introductory Physics Homework Help
Replies
4
Views
1K

Hot Threads

Recent Insights

Back
Top