Manufacturing Engineering & Technology
Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 11, Problem 15RQ

What keeps the mold together in vacuum casting?

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2. Consider a polymeric membrane within a 6 cm diameter stirred ultrafiltration cell. The membrane is 30 μm thick. The membrane has pores equivalent in size to a spherical molecule with a molecular weight of 100,000, a porosity of 80%, and a tortuosity of 2.5. On the feed side of the membrane, we have a solution containing a protein at a concentration of 8 g L-1 with these properties: a = 3 nm and DAB = 6.0 × 10-7 cm² s¹. The solution viscosity is 1 cP. The hydrodynamic pressure on the protein side of the membrane is 20 pounds per square inch (psi) higher than on the filtrate side of the membrane. Assume that the hydrodynamic pressure difference is much larger than the osmotic pressure difference (advection >> diffusion). Determine the convective flow rate of the solution across the membrane.
1. Calculate the filtration flow rate (cm³ s¹) of a pure fluid across a 100 cm² membrane. Assume the viscosity (µ) of the fluid is 1.8 cP. The porosity of the membrane is 40% and the thickness of the membrane is 500 μm. The pores run straight through the membrane and these pores have a radius of 0.225 μm. The pressure drop applied across the membrane is 75 psi. (Note: 1 cP = 0.001 N s m²² = 0.001 Pa s.)
3. Tong and Anderson (1996) obtained for BSA the following data in a polyacrylamide gel for the partition coefficient (K) as a function of the gel volume fraction (4). The BSA they used had a molecular weight of 67,000, a molecular radius of 3.6 nm, and a diffusivity of 6 × 10-7 cm2 s-1. Compare the Ogston equation K=exp + to their data and obtain an estimate for the radius of the cylindrical fibers (af) that comprise the gel. Hint: You will need to plot Ink as a function of gel volume fraction as part of your analysis. Please include your MATLAB, or other, code with your solution. Gel Volume Fraction (4) KBSA 0.00 1.0 0.025 0.35 0.05 0.09 0.06 0.05 0.075 0.017 0.085 0.02 0.105 0.03

Chapter 11 Solutions

Manufacturing Engineering & Technology

Ch. 11 - List the advantages and limitations of die...Ch. 11 - What is the purpose of a riser? What is a blind...Ch. 11 - Explain the purpose of a vent and a runner in a...Ch. 11 - How are shell molds produced?Ch. 11 - What keeps the mold together in vacuum casting?Ch. 11 - What is squeeze casting? What are its advantages?Ch. 11 - What are the advantages of the lost-foam casting...Ch. 11 - Prob. 18RQCh. 11 - What are the reasons for the large variety of...Ch. 11 - Why are risers not as useful in die casting as...Ch. 11 - Describe the drawbacks to having a riser that is...Ch. 11 - Why can blind risers be smaller than open-top...Ch. 11 - Why does die casting produce the smallest cast...Ch. 11 - Why is the investment-casting process capable of...Ch. 11 - What differences, if any, would you expect in the...Ch. 11 - Recently, cores for sand casting have been...Ch. 11 - Would you recommend preheating the molds used in...Ch. 11 - Give reasons for, and examples of, using die...Ch. 11 - Referring to Fig. 11.3, do you think it is...Ch. 11 - Explain why squeeze casting produces parts with...Ch. 11 - How are the individual wax patterns attached on a...Ch. 11 - Describe the measures that you would take to...Ch. 11 - You have seen that, even though die casting...Ch. 11 - How are hollow parts with various cavities made by...Ch. 11 - It was stated that the strength-to-weight ratio of...Ch. 11 - How are risers and sprues placed in sand molds?...Ch. 11 - In shell-mold casting, the curing process is...Ch. 11 - Why does the die-casting machine shown in Fig....Ch. 11 - Prob. 39QLPCh. 11 - What are the benefits to heating the mold in...Ch. 11 - The slushy state of alloys refers to that state...Ch. 11 - Can a chaplet also act as a chill? Explain.Ch. 11 - Rank the casting processes described in this...Ch. 11 - Estimate the clamping force for a die-casting...Ch. 11 - In sand casting, it is important that the...Ch. 11 - If an acceleration of 100 g is necessary to...Ch. 11 - A jeweler wishes to produce 24 gold rings in one...Ch. 11 - Describe the procedures that would be involved in...Ch. 11 - The optimum shape of a riser is spherical to...Ch. 11 - Sketch and describe a casting line consisting of...Ch. 11 - Outline the casting processes that would be most...Ch. 11 - Make a list of the mold and die materials used in...Ch. 11 - Write a brief paper on the permeability of molds...Ch. 11 - Light metals commonly are cast in vulcanized...Ch. 11 - It sometimes is desirable to cool metals more...Ch. 11 - The part shown in Fig. P11.59 is a hemispherical...Ch. 11 - Porosity that has developed in the boss of a...Ch. 11 - In Fig. II.1b the gemstones have been cast in...
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Casting Metal: the Basics; Author: Casting the Future;https://www.youtube.com/watch?v=2CIcvB72dmk;License: Standard youtube license