Heat transfer coefficient for Calcium Carbonate Scale 2

[ColourfulFigsnDiags]

I urgently need the thermal conductivity of typical CaCO3 scales in sea water, preferably with a decent reference? Any help would be appreciated!

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[IRstuff]

What's wrong with the articles from Google Scholar?

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[ColourfulFigsnDiags]

I didnt find anything giving me a thermal conductivity. The best I got in an interwebs search was that it was about 1% that of carbon steel ... that puts the thermal conductivity of scale around 0.5 W/mK. Yet other sources state calcium carbonate thermal conductivity is ~2.25 W/mK (Perry) ... that is a huge difference.

If you have a better reference I'd love to see it!

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[ione]

Well the answer is it depends as scale thermal conductivity is related to its porosity and it is in the range 0.4 – 2.6 W/(mK). In the attached paper (page 59) and you’ll find a table reporting thermal conductivities of some substances present in scale.

 

[IRstuff]

http://scholar.google.com/scholar?s...scale+"thermal+conductivity"&hl=en&as_sdt=0,5

The first accessible document:

http://www.ed2000.net/alfalaval/pdf_files/theory_of_electronic.pdf

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[ColourfulFigsnDiags]

ione and IRstuff ... THANK YOU! I didnt see where it said the scale thermal conductivity could be as low as 0.4 W/mK however. It says the "Fur" thermal conductivity is 1.2W/mK?

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[IRstuff]

My cite, 2nd paragraph no page 758 ~0.8W/m-K. The point is though, as explained in these papers, is that the density of the scale can be arbitrarily low, which lowers the thermal conductivity.

7th page of Google Scholar

http://scholar.google.com/scholar?s...scale+"thermal+conductivity"&hl=en&as_sdt=0,5

not free' "Scale deposits are classified according to the physical and chemical processes that occur ... Since the thermal conductivity of these crystalline deposits is very low (typically 0.5–2"

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