Problem:
You have a block of steel 10cm x 10cm x 4cm. You drill 81 holes through the 4cm dimension of the block.
The holes are on a 9x9 square grid with 1 cm spacing. The diameter of each hole is 1mm.
Required:
Question 1: Determine the porosity and permeability of the block.
Question 2: In a second block, you drill a single larger-diameter hole, so that the porosity is the same as your first block. What is the diameter of the hole? What is the permeability of the second block?
Question 3: Does the grid pattern (first block) make a difference? Explain.
Note: Please provide reasons to support your answer.