when water is poured on hot metal,it creates a characterstatic noise.Reason?

Question

is this noise different for different metals? What other parameters affect this noise?

Answer 1

water boiles at 212deg. and if the metal is hotter it will boil releasing steam that is what you hear sizzling

Answer 2

Look up "Cavitation".
The water is hot enough to boil, but often does not. Water can rise above the boiling point without boiling( adjusting for atmospheric pressure).

To form a bubble, and release the extra energy, a site ( location of the beginning of the bubble) is needed.

In a perfectly smooth container, the water may not boil, and can rise well above the normal boiling point. But can boil suddenly, and even explode. However, most surfaces have imperfections, which are where bubbles form which cause small explosions ( cavitations).
Chemists add rough stone like objects into boiling solutions to cause uniform bubble production, to keep the boiling temperature under control.
Cavitation ( bubble formation) can be quite destructive. Propeller blades are eroded when they spin too fast, and create a vacuum. The lower pressure causes the water to boil ( cavitate ) creating bubbles which are explosively formed. This creates pitting damage in the propeller.
Submarine propellers are carefully designed to minimize the effect, because as you pointed out, bubble formation is noisy, and if you dont want the enemy to detect your submarine, you need your propeller to be quiet. The effect is well known to The Navy, and each propeller signature of each enemy warship and submarine are cataloged for identification purposes. So our submarines, can identify enemy submarines by name, just by their propeller signature.


Austin_Semiconductor

Answer 3

When water is poured on hot metal the noise created is due to boiling of water. This will happen only when metal temperature is above boiling point of water. when water is sprayed on hot metal it forms steam bubbles and when it breaks it makes the characteristic noise.The noise is affected by temperature of metal and quantity and method of water spray It is not depended on the type of metal.

Answer 4

The noise probably results from:

+ the water being turned to steam

+ the metal contracting as it rapidly cools

Yes, the sound probably varies depending on the composition of the metal and depends on characteristics like density, the shape of the metal, rate of contraction, etc.

Answer 5

the noise is the same but only difference is on the type of metal and how long the noise stays it gives of noise is bcause chemicals are cooling of since the metal is hot and the water assuming is cold

Answer 6

You mean cracking and "ping" noises?

Pouring water on hot sheet-metal as opposed to a solid anvil will surely produce different sounds. Some metals will crack.

Some metals will become hardened, like steel. Copper will become soft and malleable

Answer 7

reason being that the water is being evaporated so quickly that the escaping bubbles and such are drowned by the additional water overlapping it. were you are to quench the metal 1mm at a time I doubt you would hear that noise but you can't really. believe the noise would be the same regardless of metallurgy. it's more heat + water = evaporation.

Answer 8

Heat steam rapidly moving atoms etc. Parameters, vacuum or not.

Answer 9

super heating water releases steam.parameters ambient temp.water temp.water purity.Metals conduct or release temp. specific to each metal's configuration(i/e hardness,tempered,coated,soft.

Answer 10

rusting