Lab 1-Part 2-Solidworks Flow Simulation  Engineering 1282.02H

Spring, 2016

Rishika Raj Akula, Seat 01

Savannah Coffey, Seat 02

A.Theiss Wednesday 12:40 PM

Date of Experiment: 2/24/2016

Date of Submission: 2/26/2016

 

 1.   Insert screen shot of your mesh below:

 Figure 1: Basic Mesh Plot of Channel.    

2.   Insert screen shot of your goals plot below:

 Figure 2: Max and Average Velocity Goals Plot.  

 

3.   Complete the table below with the results from your flow simulation:

Table 1: Fluid Parameter Results for Channel .

Parameter Value Max Velocity 0.0818604 m/s

Delta (over last 5 iterations) 5.803 e-7 m/s Average Velocity 0.08186 m/s Max Shear Stress 2.55 Pa

4.   Insert screen shot of your Velocity Simulation (flow trajectories) below:

  Figure 3: Particle Flow Trajectories in Channel.

5.   Insert a screen shot of your Velocity Contours (lateral) below:

 Figure 4: Lateral Profile of Velocity Contours in Channel.

6.   Insert a screen shot of your Velocity Contours (transverse) below:

 Figure 5: Transverse Profile of Velocity Contours in Channel.

7.   Insert a screen shot of your Pressure Contour below:

 Figure 6: Pressure Contour for Inlet Ports, Outlet Ports, and Channel .

8.   Insert a screen shot of your Sheer Stress Contours below:

 Figure 7: Sheer Stress Contour at Entrance of Channel.

9.   Use your fluid mechanics program to simulate the flow simulation performed in this part

of the lab. The dimensions of the complex channel you used for this part of the lab are below:

Length 22.30 mm Width 0.33 mm Height 0.13 mm

Below are the flow parameters:

Pressure Head (ΔP) Dynamic Viscosity (µ)

Density (ρ)

1000 Pa 0.0010014 Pa·s 998.16 kg/m3

Fill out the table below with the results of the SolidWorks flow simulation (from question 3) and the results from the fluid mechanics program:

Table 2: Caption goes here.

Parameter SolidWorks Fluid Mechanics Program Average Velocity 0.08186 m/s 0.063066 m/s Max Shear Stress 2.55 Pa 2.9148 Pa

How do the two results compare? What discrepancies, if any, are present? Use your knowledge of the assumptions of both simulations to think of potential causes of any differences.

•   The results of the program were fairly similar to the results from solid works, but the program value for velocity was slightly slower and the sheer stress was slightly larger.

•   These inconstancies could be a result of the assumptions we made when developing the program

o   We assumed that in the program the flow was consistently laminar from the entrance of the channel to the exit, where as solid works accounts for the characteristic that at the entrance and exit there will be some turbulent flow.

o   Another reason for discrepancies could have been from the density value. In the program the density of 998.16 kg/m3, solid works may have a more precise density that would result in more accurate velocity and sheer stress values.

10.  Briefly discuss what each of the following plots shows you in regards to the flow in the

channel simulation. Your discussion of each plot should indicate your understanding of the basic fluid mechanics principles we’ve learned in class. Be sure to address why the contours can change near the walls of the channel, where applicable.

Lateral velocity contours: Figure 4, flows the pattern of the velocity begin greatest in the center of the channel, and decreases as it reaches the walls, resulting in a parabolic characteristic. This follows the no slip condition where the velocity at the surface of the walls is essentially 0. Transverse velocity contours: Figure 5, follows the pattern of laminar flow. This can be observed in the layers of color in the figure which represent different velocities. Pressure contour: Figure 6, demonstrates that the inlet port has a higher pressure than the outlet port. This difference in pressure drives the flow fluid through the channel. The pressure gradient causes the fluid to flow from an area of higher pressure to lower pressure.

11.  Shear stress contour: What effect, if any, do the inlet and outlet areas have on the flow? What does this tell you about the importance of entrance length? How will this affect your chip design and/or experimental procedure? Reference any corresponding figures which support your claim.

o   The inlet area had a greater pressure than than the outlet area on the chip. This drives the flow of the fluid through the channel. But because of this the flow at the entrance of the channel will not be consistent, as seen in Figure 7. This show the importance of entrance length, where the flow will have time to assume laminar characteristics. For the design we will have to choose a channel length that would allow for adequate entrance length and testing region. This would effect our experimental procedure in such that we will have to make sure to begin taking measurements/readings after the designated channel length.