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Thanks, gentlemen. The intention was a chemical to promote dislodging, not dissolving the stuck aluminium dust inside as it would risk the core material too... Well, will try some miscellaneous household mild products and simultaneously attach some mechanical vibration during backwash, as there is no access to mechanical cleaning. If there is a "Do not use such !!" opinion, let me know. Otherwise, I will end at the radiator store for a new one.

Hi all. At some point a car coolant received a dosage of some aluminium powder 'supposed' to do some good. Which way would you suggest to backwash the radiator in order to remove any obstruction caused by such powder ? Would detergent, or borax, a solvent, or gasoline or something else work better without harming the aluminium cored radiator which is healthy but assumed semiobstructed ?

Hi. Which metal made thick walled container, [not foil] about the size of a coffee cup with a lid can be put in a microwave oven so the metal will heat up, heating its content by convection inside ? Would an iron, stainless, aluminium, brass, copper... cup work without damaging the oven nor making fireworks ? Or some other material that will absorb oven microwaves ? Would its shape spherical, no sharp edges... be preferred ?

I believe a limiting factor in developing higher efficiency engines is sticking since day one, to use water as coolant. My point is replacing water based coolant in ICE engines, -An oil cooled engine- with the most convenient transmission fluid. or diesel, or kerosene, or transformer oil, or refrigeration oil, or hydraulic fluid, or some other petroleum derivated, or a blend of the above -but no water content at all- Which can: - Eliminate boiling at 'normal' operating temperatures, - Eliminate rust progress or prevent it, - Eliminate pressurized circuits, - Eliminate freezing, no specialized orange, green, whatever coolant additives, - Increase efficiency with hotter combustion chamber if desired, - Even used transmission fluid at $0 is good enough, - Better heat transfer at hot surfaces due to increased wettability - No more overheating/blown head gaskets perhaps ? - What else ? The thermal conductivity and viscosity properties of some thin oils as transmission fluid that may be near to water, as cooling is its primary task in a transmission, which can run hotter than an engine. Now, are the considerations to observe : - Hoses should be oil resistant, not the kind meant for just hot water, obviously. - There is some rubber and seals in engines cooling passages; as there is rubber inside transmissions too. - Larger volume radiator to compensate difference in heat transfer parameters compared to water ? - Faster circulation pumping to compensate difference in heat capacity compared to water ? - Different pump impellers to compensate difference in viscosity compared to water ? - What else ? -----> In other words, how would you, thermodynamics expert, replace water or water-based coolant with a petroleum-based coolant for an ICE engine ? Few figures I have been able to find: Water Heat capacity = 4.2 @ 100C Thermal conductivity = 0.58 @ 100C Viscosity @ 55C = 0.55 cSt 20W engine oil @ 100C Heat capacity = 3.1 cP Thermal conductivity = 0.15 Viscosity = 6 cSt Kerosene @ 100C Heat capacity = Thermal conductivity = 0.15 Viscosity = 6 cSt Transmission fluid @ 100C Heat capacity = Thermal conductivity = Viscosity = 3.5 to 7 cSt Diesel fuel #2 @ 55C Thermal conductivity = Heat capacity = Viscosity = 1 to 4 cSt Therminol 66 transformer oil Specific heat = 0.4 Viscosity = Refrigeration oil Thermal conductivity = 0.14 Heat capacity = Viscosity =

Thanks, gentlemen.

Hi fellows. What are the parameters of consideration to evaluate the suitability of a fluid used as a closed circuit circulating and pumped cooling media ? Thermal conductivity, specific heat, thermal transfer index, heat capacity, viscosity... what else? The circuit to be a machine that gets hot and a heat exchanger to cool the circulating fluid. To replace a coolant such as transformer oil with plain water, or diesel, or transmission fluid, or other suitable ones. Or reverse, as replacing plain water coolant with kerosene, or very thin oils with viscosity near water.

As the air car project is highly unlikely to work, you can always dream of sitting the car on air instead of propel it with air : Enjoy----> http://www.flixxy.com/volkswagen-levitating-car.htm#.UDznb3I_dt0

There is a bunch of gadgets in the market that perform the levitation trick, as : http://www.amazon.com/Fascinations-Levitron-Revolution-Platform-Technology/dp/B003BWSW0E/ref=sr_1_16?ie=UTF8&qid=1344615073&sr=8-16&keywords=magnet+globe http://www.amazon.com/Anti-Gravity-Levitating-Globe-Realistic/dp/B004T4MIBM/ref=sr_1_12?ie=UTF8&qid=1344615073&sr=8-12&keywords=magnet+globe http://www.amazon.com/Fascinations-LEVG33-Levitron-Globe-Ion/dp/B002R600BY/ref=sr_1_9?ie=UTF8&qid=1344615073&sr=8-9&keywords=magnet+globe http://www.amazon.com/3-5-Floating-Globe-Magnetic-Levitating/dp/B0007KRXGM/ref=sr_1_3?ie=UTF8&qid=1344615073&sr=8-3&keywords=magnet+globe http://www.amazon.com/Fascinations-Levitron-Globe-World-Stage/dp/B002W8IH4Y/ref=sr_1_2?ie=UTF8&qid=1344615073&sr=8-2&keywords=magnet+globe http://www.amazon.com/Discovery-Channel-LEVG4-Floating-Desktop/dp/B000HZGM9G/ref=sr_1_1?ie=UTF8&qid=1344615073&sr=8-1&keywords=magnet+globe, These use plain soft iron with the least possible amount of alloying carbon to keep magnetic remanence Br to a minimum.

Not an alloy but pure iron will do it.

Successful rescue operation after a broken compass or whatever happened to these porpoises. -----> http://elcomercio.pe/player/1384898

Hi. What is being done with the heat released by spent nuclear pellets ? Is it just released to atmosphere, or some industrial application is being fulfilled ? Is the heat produced by spent pellets used to preheat water that supplies reactors thus using the energy ? For several levels of radioactivity in the spent pellets; is there a safe one (or shielded one) that if we lived in a world of saints and security was not an issue, a plain size home could use its heat for winter warming; how many pellets would do the task and how long would they last performing reasonably well ? Somewhere I read one spent pellet (about a cubic centimeter?) has the energy of 500Kg of coal. Is that right ? What are the methods of encapsulation/shielding the radioactivity of the pellets and still extract the heat for industrial uses?

Hi. Perhaps anyone knows or has/has seen the "Michael's wheel" ? Been trying to buy one and the only provider I can find feels iffy to deal with. It is supposed to be a magnetic toy / desktop curiosity; picture attached, but have no information on it. The site that had details does not exist any more. Thanks.

Am posting this in 'Engineering' as at the 'Lounge' would not make it to its level... Very worth for all ! BIBS ON ! -----> Enjoy...

Yes, sucks big time. -That could be improved to 2012181- Ordinal date

Measure the voltage when the electrodes are in water. If still ~24V, add a pinch of table salt in the water and come back with observations. If the voltage is between + & - leads, ignore the ground.

That list is not even a tenth of all the great old TV series/shows that are now unmatched by modern programming How I miss the good times !

Hi. Cannot remember the titles; One was athletic / skills / games / competition / contests, usually in stadiums, probably in Germany. By some reason I relate it to 'Shindig!', perhaps was a program of the same era. Other series was a photographer/detective, solving crimes. Unsure if it was 'Naked city' Any help ? Thanks. Edited: added- and a list of my favorites; may bring a smile to some of you... It takes a thief Tightrope The avengers The saint 77 Sunset strip Surf side 6 Combat Man from UNCLE Kojak Mission impossible Three's company The untouchables Columbo Get Smart Naked city The fugitive

HI. A red laser beam aimed to a red-tinted clear glass will pass trough ? A red laser hitting an opaque red target will bounce or be absorbed ? A red laser will bounce or pass trough a yellow-tinted clear glass ? A red laser hitting an opaque yellow target will bounce or be absorbed ? -Assume same colors are same wavelengths- What are the rules, where can I find knowledge to predict the behavior for many color permutations ? Safety goggles protect for a specific wavelength laser or for all wavelengths below the selected one ? Safety goggles protect by reflecting or by absorbing the light and dissipating it on the lens without allowing to pass trough ?

Would anyone please help find where is the trick that makes it appear to work ? ----->http://www.youtube.com/watch?NR=1&feature=fvwp&v=RkLfpXpO5sQ

Who ? The speculative greedy oportunistic professionals. -Read bankers- Where ? In their majestic chairman offices, daily licked by an army of servants, secretaries, investors, politicians...

In that context, for every source of energy you may call 'free' there will be a large number of contraptions that will convert such 'free' energy into electricity, motion, heat, light... Which input do you want to choose, and what output you want it to deliver ? We will find a device that will do it. Example; for sunlight in and electricity out; the photovoltaic cell does it. Be aware the cell costs something. Free energy could be also delivered by a machine that generates some output by itself. As "real demonstrations", none works. But this is the prettiest one I have seen. There is a hidden trick to it: ---->

Heating the pellets should melt the tin by 240 degrees C, leaving the silver. Perhaps you can manage a fun way to do it in a microwave oven. Search terms as smelter and microwave oven, you should get many leads.

Sorry for my poor expression; some induction heating/melting machines are frequency tuneable, and are adjusted depending the metal/alloy. What I do not know is if the amount of metal (dimensions) deserve also tweaking of the frequency applied. And the frequency set on the induction machine, related to the metal, has any relation/ratio with the nuclear magnetic resonance (NMR) of the particular metal ?, as in gold 1.729mhz silver 4.047mhz copper 26.528mhz A picture of a sample tuneable induction machine ----> http://i00.i.aliimg.com/photo/v0/284854188/Induction_Melting_Furnace.jpg

Is there a 'resonant/optimal' frequency to be selected for heating a particular metal/alloy, or the dimensions of the part to be worked on has a factor on selecting the frequency ?

Well, forget it. Found something. www.applepoly.com/report/burningfat.pdf They call it ketogenic mode. Thanks.