Ask Question, Ask an Expert

+61-413 786 465

info@mywordsolution.com

Ask Other Engineering Expert

Conceptual Design of Forced-Free-Mixed Convection Experiment

This assessment is to be completed individually.

1. Learning Outcomes:

- Develop a basic ability to conceptually design an experimental apparatus
- Use theory in order to guide the design of an experimental convective heat transfer system
- Enhance the theoretical treatment of convection by considering a "mixed-convection" regime

2. Background:

So far we have examined forced and free convection separately. In many practical scenarios these forms of convective heat transfer occur simultaneously, however only under certain conditions. If you were to design an experiment to test free or forced or "mixed" convection you need to first use theory in order to guide your experimental design. Figure 1 below shows you, in a horizontal tube, under which conditions (enclosed in the shaded boxes) forced convection, natural (free) convection, and mixed convection prevail for both laminar and turbulent horizontal tube flows based on previously acquired experimental data.

In Fig. 1 the "Graetz" number is Gz=RePr(d/l), μW is the fluid dynamic viscosity at the wall, μF is the film dynamic viscosity (based on the film temperature), Re, Pr, Gr and Nu are the Reynolds, Prandtl, Grashof and Nusselt numbers respectively and d and l are the diameters and length of the tube. The data in the figure is valid under these conditions:

10-2 < Pr(d/L) < 1

In practice, many of the "regimes" shown on Fig. 1 are open to scrutiny, particularly as much of the data comes from old experiments. Your task is to design the conditions for an experiment that would be able to replicate some of the convective regimes shown in Fig. 1 for laminar and/or turbulent flows.

1533_figure.png

Figure 1: Regime Map for Forced, Free and Mixed Convection in a horizontal tube. Shaded boxes indicate where different regime spaces apply

3. Specifically your tasks are:
1) To determine physical conditions and geometry that would allow for you to take measurements in "mixed convection-turbulent flow", "mixed convection-laminar"
flow regimes, and in pure forced convection (laminar or turbulent). Your theoretical experiment must be able to generate those conditions in a horizontal tube with air flowing through the inside diameter.

Specific tasks related to point 1
a. If you used air; what temperatures, tube diameter, tube length, flow-rates and/or pressures would you use to operate your experiment in the various regimes?
b. If relevant, specify any other physical parameters needed for your experiment.
c. Design an experiment that allows you to swap from one regime to another with the least amount of variables having to change.

2) Undertake a theoretical "parametric analysis" for your experiment. For example, if you want to investigate a range of Reynolds numbers from 103 to 104, you could plot what the heat transfer rate from your inner pipe surface will be as a function of flow- rate over that range, according to say mixed-convection theory. In practice, were you then to take a measurement in that mixed-convection regime from your experiment, you would have some theory to compare too. You could also for instance, consider what your heat transfer coefficient should be as a function of the Reynolds number or another dimensionless number. These two examples are only suggestions to what you could plot or analyse, however you must have at least 4 graphs in your results (including at least 1 item of analysis which excludes the two examples given above).
Specific tasks related to point 2
d. You must generate at least 4 graphs plotting one relevant quantity vs. another, comparing/contrasting theoretical results of mixed convection to pure forced convection, discussing differences in trends in your plots.
e. You must discuss, in practice, what specific measurements you would take in order to test the validity of your theoretical results. Consider where/how you would take the measurements from your horizontal pipe. You may also consider what sort of equipment you would use here (of course you may draw on the experience gained from the prac sessions).

What is the point of this?

The purpose of this analysis is to show how one variable will affect another "in- theory", therefore giving you something to expect were you to run an experiment. If in practice you then did not acquire the expected result in your experiment (within experimental error), and you are certain your experiment is well-designed, it means the theory does not hold up and requires revision.

4. Written Report
The written reports should follow the normal guidelines for technical report writing (some suggestions are given below). In particular, there must be an Executive Summary which concisely reports the objectives and conclusions reached, as well as a reference list.
- Responses to the questions raised in the section "3. Specify your tasks".
- Presentation and discussion of the results of analyses.
- Describe what parameters/equations were used to specify the problem.
- Describe how (and why) the calculations were carried out.
- Present a summary of the results obtained (figures if needed).
- Discuss the results obtained.

We appreciate that some of you may have limited experience in writing technical reports. This is an important engineering skill. Here are some tips:
- Technical writing is not essay writing. There is no need for flowery words or grand

sentences - simple clear language is best.
- Skills needed for technical writing are exactly those needed to be a successful engineer
- logic & precision.
- Present the information in the order in which readers can best follow it.
- Write from the reader's perspective.

5. Assessment
This assignment contributes towards the assessment of MECH302. You will work for this project and hand in a report. The report will be marked out of 30.
- Report due on Sunday 11th November 2018. For assignments handed in late the following penalties apply: 0-24 hrs - 25 %, 24-48 hrs -50%, more than 48 hrs -100%.
- Report must not be longer than 8 pages plus appendices, executive summary (max 1 page) and references.
- All relevant supporting material calculations must be incorporated into an Appendix.
- Must reference sources of information and include a complete reference list.
- The report must be well written, concise and clear.
- Report must address key aspects outlined in 3. Specify your tasks.

Other Engineering, Engineering

  • Category:- Other Engineering
  • Reference No.:- M93135880
  • Price:- $70

Guranteed 36 Hours Delivery, In Price:- $70

Have any Question? 


Related Questions in Other Engineering

Projection of planes1 a regular pentagon of 25 mm side has

Projection of Planes 1. A regular pentagon of 25 mm side has one side on the ground. Its plane is inclined at 45° to H.P. and perpendicular to the V.P. Draw its projections. 2. Draw the projection of a circle of 50 mm di ...

Assignment 11 what is the purpose of ore reserve and

ASSIGNMENT 1 1. What is the purpose of ore reserve and resource estimation? Why are resource and reserve estimates important to the mining industry? 2. What is meant by ore? What is meant by the term waste? How is the di ...

Learning outcomes evaluate multiuser communication and

Learning Outcomes Evaluate multiuser communication and resource sharing techniques; Apply the techniques of, and report on, digital communication applications using Matlab and hardware devices. Assignment Description The ...

Engineering analysis assignment -for every problem provide

Engineering Analysis Assignment - For every problem, provide The MATLAB script/function files that solve the problems. Problem 1: Plot the function f(t) = (x+5) 2 /(4+3x 2 ) for -3 ≤ x ≤ 5. using plot command. Use the ar ...

Register design a cpu register is simply a row of

Register design A CPU register is simply a row of flip-flops (i.e. SR, JK, T, etc) put side by side in an array to make the size of register required. For example, an 8 bit register has 8 flip-flops side by side for stor ...

Task 1using the lab kit design a circuit for the processor

Task 1: Using the lab kit, design a circuit for the processor to control the output of a connected 7-segment LED display device. You will be provided with a standard common anode 7-segment display of the type FND-507 (or ...

Assessment practical reportproduce a short technical report

Assessment: Practical Report Produce a short technical report in a form consistent with proteomic journals covering the techniques, results and interpretation of your proteomics experiment in the practical classes. The r ...

Control theory - lab reportsfor experiments 1 to 4 you must

Control Theory - Lab Reports For experiments 1 to 4 you must undertake the following: a) At the start of each section (including the pre-lab activities) there are a number learning outcomes. That is, what students should ...

Engineering materials term paper assignment -conduct a

ENGINEERING MATERIALS TERM PAPER ASSIGNMENT - Conduct a thorough literature search and write a 15-20 page technical review paper on the evolution of the engineering materials used in the manufacturing of any one of the f ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As