Setting up the problem
Results
Humidity
Humid Climates
100

Which has a higher diffusivity into water, cotton or wool?

Wool

100

Which fabric works better for clothing in humid climates?

Cotton

100

What is the difference between absolute and relative humidity?

Absolute humidity is the concentration of water in the air. Relative humidity is the percentage of water in the air compared to the maximum amount it can hold. Relative humidity is a function of temperature while absolute humidity is independent of temp.

100

Name 3 adverse health effects of experiencing high humidity.

  • Dehydration, sweating causes us to lose water and nutrients
  • Fainting, the heat causes blood to rush to other areas of your body, causing a sudden blood pressure drop in your brain
  • Heat rash, a condition where sweat gets trapped under the skin and causes irritation
  • Heat exhaustion, a sustained loss of fluids due to heat/sweating
  • Heat stroke, when the body reaches an internal temp of 104 F or higher
200

List 3 assumptions we could make for this problem.

- No reaction

- Dilute A

- Binary mixture of A + B

- 1D flux in the z-direction

- Isothermal at T = 25 C

- Isobaric at P = 1 atm

- Semi-infinite media

200

Name two parties who could benefit from our work

1. Clothing manufacturers

2. Consumers

3. Two Towers Consultancy

200

What is the formula for absolute humidity?

AH = (mH2O/V), where the numerator is the mass of the water vapor in the air, and the denominator is the total volume of the air and water.

200

Why do bad smells seem to be stronger when it's warmer?

Odorous particles can bind to water molecules and travel into our nose. When there is more water in the air, there are more molecules to attach to, so more of these particles or bad smelling bacteria enter our noses.

300

What are some appropiate boundary conditions for this problem?

IC: At t = 0, CA = CA0 = 0

The concentration in the fabric starts at zero.

BC1: At t > 0 and z = 0, CA = CAS

At surface, water vapor concentration is equal to air.

BC2: At t = 8 hours and z = ∞, CA = CA

The conc. at time t and distance is the solution.

300
Why should Two Towers care about our project?

They can leverage this research to be able to advise their clients on manufacturing and marketing choices.

300

What is the name of the device commonly used to measure humidity?

Hygrometer, also known as a wet and dry bulb thermometer.

300

Which country has the highest average relative humidity?

Singapore, with an average annual relative humidity of 84%

400

List 3 simplifications we could make to our combined continuity/Fick's rate equation.

1. Constant density (incompressible fluid) --> ∇ ∙ V = 0

2. No reaction --> RA = 0

3. No fluid motion V = 0

400

How could future projects expand upon/continue this research?

- More diversity in fabric materials being tested

- Different manufacturing processes could be taken into account.

400

What was originally used to measure humidity in the 1700-1800s?

Human hair. Horace Benedict de Saussure built the first device to measure humidity in 1783 by utilizing the moisture-absorbing properties of hair.

400

What was the highest dew point ever recorded?

95 F (35 C) in Dhahran, Saudi Arabia on July 8, 2003

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