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  • Users: Lukezo
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  1. Lukezo

    Tube bundle

    Hi guys, my application is flow over across an (in-line or staggered) cylinder bundle. I need to ensure constant velocity along stream as fluid is water. How to do that? Then, how can I simulate heat transfer?
  2. Lukezo

    Capillary tube

    Hi, can you please ellaborate on topic of ordinary capillary tube In particular, I am interested in bubble entering the tube Thanks in advance, lukezo
  3. Lukezo

    Buoyancy driven flow

    Hi people, I'm about to model flow of air inside a vertical tube with air inlet at the bottom of tube about a feet away from bottom. The air gets moist and warm inside tube. Can you ellaborate on boundary conditions? 2. Which is the appropriate outlet condition?
  4. Lukezo

    Mixing temperature

    Hi, I have all data on mixing vapor, starch and water (temperatures, pressure) and when I make a balance: m_vapor_in*h_vapor_in+m_water*cp_water*T_water=(m_water_in+m_vapor_in)*cp_water*T_mix_measured+m_starch* cp_starch_new*T_mix_measured+E_endo) I get a result, that expression on left is...
  5. Lukezo

    Heat exchanger surface temperature

    In a water vapor condenser HTC there is a 'wall temperature'. How to proceed? I was thinking about guessing it and calculating iterations, but how do I verify it?
  6. Lukezo

    Water vapor condenser

    Hi, I have to heat 250L/min water from 20degC to 50degC by using superheated steam (150°C, 3Bar), mass flow rate by demand. The question is, which heat exchanger is the best choice. Thanks!
  7. Lukezo

    Compressor choice

    Hi, I need a compressor capable of producing suction pressure 2,5Bar, discharge 10Bar with cooling capacity up to 2kW. Whats the choice I should make? Edit:R134a.
  8. Lukezo

    Heating foil simulation

    Hi people. I want to simulate time dependent heating up of a following setup: -heating foil (200W)surrounded by two plates of same area -upper plate is insulation: k=0,035W/mK width=0,2m -bottom plate is clay: k=1W/mK width=0,05m I would like to find out how to reach stationary state. In...
  9. Lukezo

    Refrigerant split problem

    Hi people, I am dealing with a fin and tube heat exchanger model of a condenser R134a. I would like to know the following: - is it possible that mass flow rate in the upper circuit differentiates from mass flow rate in bottom circuit? - are split temperatures of refrigerant in both upper and...
  10. Lukezo

    R134a superheat htc correlations

    Dear all, I am modeling a heat pump heat exchanger and have some difficulties determining the superheated heat transfer coefficient of R134a @pressures up to 16Bar and temps up to 90degreeC. Can someone please give me a hint about htc coefficient for enhanced horisontal tubes (diam 7mm...

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