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  1. MisterE2

    Finding the temperture of the glass on an incandescent light bulb

    Thermocouple, no point in theoretical calculations if you can directly measure it... Also no idea why anyone would recommend an IR camera, its a polished surface, you'll need to apply a surface treatment to get an accurate measure, change the camera setup to cut the signal, recalibrate to the...
  2. MisterE2

    fluid mixing inside a water block

    eh, actually nevermind, nothing inexpensive exists that i can shove into a waterblock without everything being exposed to anodic/cathodic reactions from the copper, back to using pumps
  3. MisterE2

    fluid mixing inside a water block

    So, I've been messing around with a hybrid water block-heat pipe design for a few months. I'm just crossing out possibilites for fun with a sla printer and a miniscule budget. Anyway, I want to experiment with adding more mixing to some prototypes, and I have no idea what a submersible motor...
  4. MisterE2

    Calculate time for heat to transfer through a plate

    homework problem...
  5. MisterE2

    Emissivity coefficient of aluminum black-anodized surface on ambient temperature

    Its probably not a great idea to look up and plug in an emissivity coefficient for "anodized aluminum" you'll be faced with the question later on of "ah, anodized (our color or material) aluminum?" just grab your thermal camera and thermocouple and do it manually with a heat gun on the cool...
  6. MisterE2

    Unsteady state heat transfer in an aerosol can

    gah... that's an awful method of "testing" even if you heat the can up to 150' C the gas isn't going to heat up and go to high pressure to cause a failure. It'd probably be more effective to just randomly pull cans and throw them in a stove for batch testing
  7. MisterE2

    cooling system

    its natural convection, the formula you just mentioned is not that...
  8. MisterE2

    Insulation nano-paints

    Yeah, they seem to be really big on including the color "green" and mentioning the environment at every turn available on their page... They don't even mention the word Nano attached to anything, Nano just means 10^-9. So the question is Nano, what? If they said they had a ultra low density...
  9. MisterE2

    What rubber insulator can be attached to hot aluminum alloy?

    Ah wait, there may be easier solutions. Some important questions I've run across this a lot of times before. Is the impact driver; a one time use for your company only, a mass production model for sale and more importantly are employees required to regularly handle it and on what frequency?
  10. MisterE2

    What rubber insulator can be attached to hot aluminum alloy?

    I was thinking of just attaching a refractory material... but then i remembered a easier solution, make some carbon fiber parts w/ glue It looks pretty easy to put an intern up to Link
  11. MisterE2

    Force Convection Heat Transfer

    Eh... well seeing as how the fans and biscuits are pretty inexpensive, and your time is not... buy a bunch of fans. You could indeed solve this analytically, but cooling a of a cooked biscuit means that biscuit has nice scattered heated pockets of air, making it a matrix material of no...
  12. MisterE2

    cooling in Vacuum

    going to need more info on the chamber, standard pump and seal? diffusion pump? size? It eliminates a lot of possibilities if you have to worry about something outgassing in a chamber
  13. MisterE2

    Enthalpy and PV value Question

    Uh, elastic sphere would be a different equation, its usually better to start back from an energy equation to avoid a contradiction invented by undergrad textbooks/lessons so PE+KE=PE+KE then insert heat into KE, drop out PE in the left half and in the right half do work by the spring of the...
  14. MisterE2

    How to measure flash steam flow rate

    So really quick, buy some copper tubing from home depot, attach it to the flue of the oven, wrap it around something cold and have it drain down to a gallon jug, get a scale and weight the condensate after a set period of time, after the tubing's flow rate reaches steady state(should be a...
  15. MisterE2

    flow performance test

    also, you won't be able to check the flow rate, you have natural convection which is being interfered with on a minute by minute basis by heat loss by natural convection... well not won't be able to but it would take at least a month to run a CFD simulation, converge it and then calculate the...
  16. MisterE2

    flow performance test

    What's the temperature at night? you could just add some thermal capacitance, i.e. a fishtank full of water, that or make it more reflective as its key source of heat is just going to be the sun.
  17. MisterE2

    Less Heat Transfer When Pumping More Hot Water Through A Coil???

    I'll agree w/ that on the right hand side, it encourages mixing of the entire fluid stream, with fully turbulent flow there's no argument there will be more heat transfer and a fully mixed fluid. I think just past the transition point to turbulent flow, with recirculating zones and weakly...
  18. MisterE2

    Less Heat Transfer When Pumping More Hot Water Through A Coil???

    Eventually with more fluid flow you would get more heat transfer and a more consistent DT along the boundary. But until then, there will be flow separation, the fluid will be plagued by recirculating zones and vortices building up and detaching from any area that has a deformity or odd...
  19. MisterE2

    Less Heat Transfer When Pumping More Hot Water Through A Coil???

    Sadly I almost wholeheartedly agreed until I remembered that there is a simple case that can prove the poor pipefitters point, flow over a backwards facing step has exactly this happening, the fluid passes over a step and then forms a weakly recirculating zone, basically heat transfers less...
  20. MisterE2

    Increasing air flow rate in a ventilated roof

    Why would you need to? That type of roof tile is designed to have minimal contact with the roof and not to expand to knock the other tiles off.

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