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Midland Wire Cordage Ltd (MWC) are pleased to announce the formation of their Heat Transfer Division to develop heat transfer technology and to provide an improved service to their customers.

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Manual Design Method for HTD Removable Turbulators

Objective:

To calculate hi for fluid flowing through tubes using HTD removable turbulators.

  1. Calculate flow area through plain tubes:
    A = (Nt x ∏ Di2)/(Np x 4)
  2. Calculate fluid mass velocity through plain tubes: Gi = W/A
  3. Calculate Reynolds Number in plain tube: Rei = (Gi x Di)/μ
  4. Select insert to be considered in the design
  5. Using either the appropriate performance curve or the mathematical solution, determine the values for heat transfer factor (JH) and friction factor (f) corresponding to the Rei value calculated in step 3
  6. Calculate hi = JH x (k/Di) x Pr1/3 x (μ/μw)0.14
  7. Calculate pressure drop through tubes from:

    ΔP = (Z x f x L x Np x Gi2)/(g x ρ x Di x (μ/μw)0.14

    Where Z = 9.807 x 10-5 for SI units, giving ΔP in bar

              Z = 5.36 x 10-10 for English units, giving ΔP in Ib/in2
  8. Iterate design to optimise the relationship between through and over tubes performance, taking into account any variations of external surface which may be appropriate.
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