HW3_v2_KS_11_48_PM_16_Sept

HW3_v2_KS_11_48_PM_16_Sept - Chemical Engineering 150B Fall...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chemical Engineering 150B- Fall 2005 Problem Set #3 Due Wednesday September 21 st , 2005 Note: There are 3 problems in this assignment (see back of both pages). Problem 1. (15 points) A common procedure for increasing the moisture content of air is to bubble it through a column of water. The air bubbles are assumed to be spheres having a radius of 1 mm, and are in thermal equilibrium with the water at 298 K. Determine how long the bubble should remain in the water to achieve a vapor concentration at the center that is 90% of the maximum possible (saturation) concentration. Assume the air dry when it enters the column of water, and that the air inside the small bubble is very small. The vapor pressure of water is available from many sources, including the steam tables. Problem 2. (35 points) Liquid benzene leaked from a storage tank and seeped into the ground below. Since the density of benzene is less than the density of water, the liquid benzene formed a light nonaqueous-phase liquid layer on top of the water-saturated solid as shown: Dissolved benzene diffusion Nonporous rock layer Benzene storage tank Liquid benzene spill (on top of soil) 1 m At a depth of 1 m below the water-saturated soil layer is a nonporous, impermeable rock layer. There is no ground water flow through the water-saturated solid layer; it is completely stagnant. Initially, there is no benzene dissolved in the water-saturated soil layer. Although water- saturated solid is a complex mixture, as a medium for benzene diffusion you may assume that it approximates the properties of a homogenous substance. The pure liquid benzene layer resting on top of the solid is essentially a constant source due to the low solubility of benzene in water.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern