Cooling Mist

[median]

[Will you have to add a colouring to it, otherwise people will think there's nothing there... 

Good idea DT

We'll make the powder out of cochineal..add some bicarb to add some effervescence.

It'll be bigger than Peckham Spring...or for that matter Dasani  ;D ;D ;D







Edit: fix the quote tag.

[doubting thomas]

So does it make a difference if the water is cooler to start with? Obviously it feels different when you spray it, but does the convective heat thingummy and the energy evaporation whatsit effect change with the temperature of the water?

The temperature of the water will make a difference to both conductive and convective losses.
The greater the difference in temperature between hot and cold body then the more rapid the energy exchange to reach equilibrium will be and the lower the equilibrium temperature will be, given that the initial hot temperature is the same in both cases (50 to 40 vs. 50 to 10 for example)
Evaporative heat loss is relatively unaffected.
:)



:wnw: :wnw: :wnw:

[Admin]

So does it make a difference if the water is cooler to start with? Obviously it feels different when you spray it

Colder water will have more of an effect and also the size of the droplets too. The finer the spray the better the cooling effect. It's probably to do with the larger total surface area of the combined droplets.

The most important factor though is the use of Skepta Water (http://www.ukskeptics.com/article.php?dir=articles&article=skepta_water.php)TM ;D

[Aardvark]

Will you have to add a colouring to it, otherwise people will think there's nothing there... ;D ;D


We will obviously leave out the colouring in the homeopathic version :D

[median]

The most important factor though is the use of Skepta WaterTM

Christ is that what it's called?...order me a jeroboam of the stuff


[Colder water will have more of an effect and also the size of the droplets too. The finer the spray the better the cooling effect. It's probably to do with the larger total surface area of the combined droplets.


Actually, irrespective of whether your are drenched with a hose or sprayed with an aerosol. The result should eventually be the same. The droplets on the skin will coalesce to a finite size.
Mind you, this will possibly be modified to some extent, depending on how well 'oiled' you are (oo-err) or if you a hairy bastard or not.

Sorry, I have better things to do than to measure the output of sweat glands on hirsute individuals.

Skeptic, possibly......fetishist.....never...

Errmm...does moleskin count? ::)






Edit: fix quote.

[tkingdoll]

So does it make a difference if the water is cooler to start with? Obviously it feels different when you spray it

Colder water will have more of an effect and also the size of the droplets too. The finer the spray the better the cooling effect. It's probably to do with the larger total surface area of the combined droplets.



Hmm. OK, so it's safe to assume that the aluminium can will keep the water cooler than a plastic bottle?

And from what I saw, the spray was finer than a plant mister will give you.

So perhaps it's not a ripoff after all, just a bit overpriced and wasteful (regarding the can).

I'd like to experiment with the Cooling Mist and a plant mister and see if there's any discernable difference, but that'll be impossible to blind if one spray is finer. I could do a subjective test I suppose.

[vbloke]

also, you could try one with boiling water to see if cooler water vs hot water makes a difference >:D

[median]

Hmm. OK, so it's safe to assume that the aluminium can will keep the water cooler than a plastic bottle?

Teek

Theoretically, the aluminium can would be more susceptible to temperature fluctuations than plastic (which is the greater insulator). If the ambient air is very warm the contents will heat up.

However aerosol cans are subject to a process of cooling when some of the propellant gas used is released and the remaining gas expands to fill the volume. This might make exact comparisons difficult.

Anyway, Cooling Mist holds no allure pour moi

I go for the Lynx Effect (grrrowll) :-* ;)

Barf! ;D

[doubting thomas]

Median

You appear to be quite knowlagable about all this so I'm going to add one more variable, what about distilled water.

Do you think this would slow or speed up evaporation? :D

[median]

Interesting question DT

The rate of evaporation is going to be driven by factors such as heat and surface area of evaporating body irrespective of the composition of water.

It could be argued that dissolved salts could have an effect on a water composition's heat capacity but given that we are talking about 0.1% of the total volume, then I would have though the effects would be negligible.