I have an ice crusher that looks like a garlic press, only it uses metal
teeth to crush ice cubes. If the jaws are closed slowly, they sink into the
ice cube rather than breaking it to pieces. My back-of-the-envelope
calculation says that the pressure on the teeth is less than 200kPa, so I
don't think that the melting point is affected by the pressure.

It's just like a wire being drawn through a block of ice, with the block
remaining intact. My guess is that in both cases, the combination of metal
being a good conductor and the pressure at the interface aid in melting the
ice rapidly.

What are your thoughts?

-Mike Simons

Mike Simons wrote:

I have an ice crusher that looks like a garlic press, only it uses metal
teeth to crush ice cubes. If the jaws are closed slowly, they sink into the
ice cube rather than breaking it to pieces. My back-of-the-envelope
calculation says that the pressure on the teeth is less than 200kPa, so I
don't think that the melting point is affected by the pressure.

It's just like a wire being drawn through a block of ice, with the block
remaining intact. My guess is that in both cases, the combination of metal
being a good conductor and the pressure at the interface aid in melting the
ice rapidly.

What are your thoughts?


That there is likely to be a great deal of difference in the
outcome if the ice is -200F as opposed to being somewhere in
the range of 0-32F (depending on other unstated variables,
of course.)

Google Image Result for shipbroker.gr/ships/shiprepo.jpg
Address:http://images.google.com/imgres?imgu...D%26ie%3DUTF-8
Ice breaker ,,,,,,,,,,

(tj Frazir) wrote:

Google Image Result for shipbroker.gr/ships/shiprepo.jpg
Address:http://images.google.com/imgres?imgu...D%26ie%3DUTF-8
Ice breaker ,,,,,,,,,,


You are so silly.

Jim

Jim wrote:
(tj Frazir) wrote:

Google Image Result for shipbroker.gr/ships/shiprepo.jpg
Address:http://images.google.com/imgres?imgu...D%26ie%3DUTF-8
Ice breaker ,,,,,,,,,,

You are so silly.

How does he do with a lampshade?

Mike Simons wrote:
I have an ice crusher that looks like a garlic press, only it uses metal
teeth to crush ice cubes. If the jaws are closed slowly, they sink into the
ice cube rather than breaking it to pieces. My back-of-the-envelope
calculation says that the pressure on the teeth is less than 200kPa, so I
don't think that the melting point is affected by the pressure.

It's just like a wire being drawn through a block of ice, with the block
remaining intact. My guess is that in both cases, the combination of metal
being a good conductor and the pressure at the interface aid in melting the
ice rapidly.

What are your thoughts?

200kPa is just double the ambient airpressure.
Easily achieved by some mechanic lever and a structured
surface.

Rene
--
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