A heat exchanger consists of six identical stainless steel tubes connected in parallel as shown in Fig. 1.94. If each tube has an outer diameter \(0.00825 \mathrm{~m}\), inner diameter \(0.008 \mathrm{~m}\), and length \(1.3 \mathrm{~m}\), determine the axial stiffness and the torsional stiffness about the longitudinal axis of the heat exchanger.

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07 D FIGURE 1.94 A heat exchanger.