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1.35 . Hydrodynamic flow through a porous diaphragm Consider the hydrodynamic flow of nitrogen at 400 K through the porous diaphragm described in Example 1.24. It is desired to achieve a superficial gas velocity through the diaphragm of 0.28 kg of N./m2.s by increasing the upstream pressure while maintaining the downstream pressure constant at 0.1 atm. Calculate the upstream pressure required. Answer: 13.64 kPa