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Mensaje: <blockquote data-quote="fepago" data-source="post: 1059087" data-attributes="member: 13568">con respecto al agua caliente de los submarinos, resumen poara los que no leen ingles: tanoarg aparentmente tiene razon.abajo la justificacion tecnica:submarine's propulsion system operates at very high temperatures of several thousand degrees C and all three methods of heat transfer must be taken into account. However, convection and conduction of the waste heat to seawater is the primary way of cooling a submarine. However, remote sensing usually relies on monitoring the heat radiation from an object including it's heating of the surrounding environment, which in this case is the seawater around the submarine. Let us assume that the submarine is expelling boiling water at 100 degrees C (Celsius). The wavelength for the peak of the thermal radiation spectrum (Black body radiation) for a material at a temperature of 100 degrees C is determined by: Max Wavelength (in micrometers) = 2897 divided by the temperature in degrees K 0 degrees C = 273.16 degrees K, thus boiling water is at 273.16 + 100 = 373 degrees K. Max Wavelength = 2897 / 373 = 7.8 micrometers in the infrared. From References 1 and 2 we find that at 7.8 micrometer wavelength the attenuation of water is greater than -30 dB per meter. This means that for a given amount of energy entering a meter of length of water only 0.1% passes through the meter and the 99.9% of the energy is absorbed or scattered. The second meter of water will attenuate 99.9% of the original 0.1% entering and an insignificant amount of thermal radiation would remain. Thus we conclude that we will only be able to detect a submarine by thermal radiation only a few meters under the water. If the submarine were traveling on or near the surface, the surface radiation from the water heated by the submarine might leave a thermal wake which might be detectable. However, detecting thermal radiation directly from the submarine at a depth greater than a few meters would be very difficult if not impossible and submarines usually travel at much greater depths. We know that in clear water we can visually see a submarine at a much greater depth than a few meters because of the blue - green "window" in water; however, the thermal radiation from the submarine at these wavelengths is negligible. despues sigo "refutando" sus dichos!saludos.</blockquote>

Verificación: Libertador de Argentina