The goal is to obtain an experimentally based coreelation for the j-factor for heat transfer as a function of Re for the flow.

Because the fluid enters the larger tube from a much smaller diameter tube, the flow will not likely be a simple Poiseuille flow over the length L. Hence our theory for the Nusselt number for the laminar flow is not expected to be reliable. For this reason, en experimental program is necessary.However, we will use the simple laminar flow heat transfer model to estimate the behavior expected under and set of proposed design comnditions. In other words, we use the available( though imperfect) model as an aid to design.

Make a choice for wall and inlet temperatures. What fluids will be used, justify your choice. Give the required physical properties for the fluids. For one set of selected conditions, estimate and plot the outlet temperature for the required rangeof temperature as a function of the mass flowrate. L values of 10 and 40cm are to be studied. You may need a separate set of design parameters for each case. Describe how you will impose a constant wall temperature on the tube surface, but not on the outlet and inlet tubes.

## This question was asked on Mar 25, 2010.

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