I am doing heat transfer analysis for multiple 0.5-0.25 mm heating elements in an enclosed shell of about 0.25 m across, with cross flow over said bank of heating elements with water as the fluid at about 10 degree Celsius. I am trying to do preliminary work using A. Zukaukas cross flow experimentally derived correlations but my "h" values are too high, in the range of 100,000 which is in-line with boiling water even though for the calculations I assumed constant surface temperatures in the inflow and heating element. It is worth mentioning that the heating elements mW range powered and there is a couple of thousand of them.
h=100,000 what? [W/m²/°C]? I have seen many empirical correlations produce unreasonable results due to unit errors. Are you sure these all work out correctly. I have also seen many tables (even in prestigious references) that are incorrectly labeled W, kW, g, kg, m, mm, etc. I only noticed the errors because I knew what the approximate values were, like the specific heat or thermal conductivity of water. Calculate the Nusselt number. If it's way out of range, there's usually a problem with units.
Thank you both for your replies. You are both right, there was an error in my coding in unit conversions.
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