The Number of Transfer Units (NTU) Method is used to calculate the rate of heat transfer in heat exchangers (especially counter current exchangers) when there is insufficient information to calculate the Log-Mean Temperature Difference (LMTD).
Turbidity is the measure of relative clarity of a liquid. It is an optical characteristic of water and is an expression of the amount of light that is scattered by material in the water when a light is shined through the water sample. The higher the intensity of scattered light, the higher the turbidity.  I’m not taking much away from this except people are nosey busybodies. Still, I would also say OkCupid looks like an okay site and you shouldn’t worry about it -- moderators are not deleting people for no reason, the complaints are pretty mild. There’s a shining little glimmer of hope for mankind. This interview has been edited and condensed for clarity. NTU. Nuclear Time Unit (3.53 x 10-19 seconds; length of time for a ray of light, traveling in a vacuum, to span the distance equal to the diameter of a hydrogen atom).  Turbidity is measured in nephelometric turbidity units, or NTUs. Nephelometric simply means how cloudy the water is. The picture above shows different NTU values for samples of water. Drinking water must have less than 0.5 NTU, more clear then the beaker of water shown above with a 10 underneath. Turbidity is a measure of how clear the water is. High turbidity means that there are a lot of particles suspended in the water and light cannot get through. Low turbidity means that there are fewer particles in the water and it is more clear. Turbidity in a stream may increase from: 1  soil erosion. 2  higher levels of algae. The definition of Turbidity is the cloudiness or haziness of a fluid caused by suspended solids that are usually invisible to the naked eye. The measurement of Turbidity is an important test when trying to determine the quality of water. The most common measurement for turbidity in the United States are the Nephelometric Turbidity Units (NTU). There are several ways you can check turbidity in water, the most direct being a measure of attenuation, or reduction in strength, of a light source as it passes through a water sample. From Wikipedia, the free encyclopedia. (Redirected from NTU Method). The Number of Transfer Units (NTU) Method is used to calculate the rate of heat transfer in heat exchangers (especially counter current exchangers) when there is insufficient information to calculate the Log-Mean Temperature Difference (LMTD).  Turbidity (or haze) is also applied to transparent solids such as glass or plastic. In plastic production haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction. Turbidity standards of 5, 50, and 500 NTU. Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality.
http://water.usgs.gov/edu/turbidity.html http://www.huffingtonpost.com/2012/10/21/okcupid-moderator-dating-website_n_1994775.html http://acronyms.thefreedictionary.com/NTU http://techalive.mtu.edu/meec/module05/Turbidity.htm http://www.lamotte.com/en/blog/test-factors/91-what-is-turbidity https://en.wikipedia.org/wiki/NTU_Method https://en.wikipedia.org/wiki/Turbidity
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