[FRIAM] Science question...re: cold neck scarfs
Steven A Smith
sasmyth at swcp.com
Thu Jul 19 20:08:10 EDT 2018
Gil -
There is always a lot of blood flow between the heart and the brain
which passes through the neck, fairly close to the skin. Among the
many things blood does, is act as a working fluid to try to help
thermoregulate the body... passing hot blood near the surface of the
skin where evaporation of sweat is cooling the skin... The neck would
be an obvious place to apply extra external cooling efficiently.
As with a cool cloth on the head, I think there is a perception issue
involved, meaning that when you are overheated, cooling the region of
your body you associate with "self", likely *feels* better than say,
cooling your feet or your glutes... provides quicker apparent relief.
I'm aware of the type of fabric you speak of, but have never used or
inspected any. I'm assuming it somehow manages to *both* hold enough
water to not evaporate away immediately but at the same time, have
enough surface area (microstructure) to allow for a lot of
transpiration. Why "snapping" it abruptly works to (re)improve it's
cooling potential isn't as obvious to me, I'm betting it has been
written up many times in everything from the popular press to academic
journals in material science... time to practice more Google-Fu?
- Steve
On 7/19/18 3:58 PM, Gillian Densmore wrote:
> Preface: I am not a fan of email...in it's current form. I have some
> pretty good notions to why. I will respect the mods and leave it their.
>
> However, Mr. Homes yes! that is part of wonderful sense of curiusity
> why they are so helpful and why you can get some to refresh some... A
> shirt made sense I thought (it's got a lot of it to it)
> But basically bit of swim suit material around my neck helping? oO
> So...just out of curiosity I thought: let me ask!
>
> On Wed, Jul 18, 2018 at 8:40 AM, Robert Holmes
> <robert at robertholmes.org <mailto:robert at robertholmes.org>> wrote:
>
> If you really want to blow your mind, consider these mesh cooling
> towels: https://www.amazon.com/gp/product/B06Y4RW17N/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
> <https://www.amazon.com/gp/product/B06Y4RW17N/ref=oh_aui_search_detailpage?ie=UTF8&psc=1>
>
>
> When you've been wearing it for a while and it has warmed up, you
> take it off, give it a sharp "snap", and it's immediately cold again.
>
> I use one when the temperature is getting high in my
> (non-air-conditioned) house and it works a treat.
>
> —R
>
> On Tue, Jul 17, 2018 at 9:30 PM Gillian Densmore
> <gil.densmore at gmail.com <mailto:gil.densmore at gmail.com>> wrote:
>
> AHA! googlefu skills worked better this time. Something to do
> with with the neck (for example) helps with body heat and the
> wraps let off cold water...
> I guess I just don't understand how something that small can
> help cool you down. So I just thought I'd ask what the science
> might be
>
>
>
>
> On Tue, Jul 17, 2018 at 9:00 PM, Gary Schiltz
> <gary at naturesvisualarts.com
> <mailto:gary at naturesvisualarts.com>> wrote:
>
> Are you getting overheated during class? I would assume
> that your teacher is suggesting this as a way to help keep
> cool. Evaporative cooling is especially effective in dry
> climates like Santa Fe.
> See https://en.wikipedia.org/wiki/Evaporative_cooler
> <https://en.wikipedia.org/wiki/Evaporative_cooler>.
>
> On Tue, Jul 17, 2018 at 9:29 PM, Gillian Densmore
> <gil.densmore at gmail.com <mailto:gil.densmore at gmail.com>>
> wrote:
>
> I has a science question. I trying out doing more
> excersize. In one of my zumba classes a teacher
> sugested I try a wet towel on my head (before class)
> and then a wet scare around my neck during class.
>
> I feel as my googlefu skills are failing because I
> can't find a reason why that helps. Anyone know what
> the science is?
> LifeHacker and a pretty dated StackScience blurb
> speculated it has to do with having just enough gold
> water (relative to the hot air neer your body) to
> somehow make kind of cool air zone.
> Somehow how I am...skeptical
> Cooling of your head makes sense (hair gets wet and
> you cold water on your head just feels really good in
> the summer)
>
> But I don't get why cold towel or scarf around your
> neck can help.
>
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