Molten aluminum is passed through a horizontal filter bed of ceramic spheres in order to remove drossy oxides from the aluminum. the filter bed comprises two different packings arranged in series. the first packing captures large drossy particles, and the second packing captures the smaller drossy particles. given 퐿퐿퐴퐴=0.7 퐿퐿퐵퐵,휀휀퐴퐴=휀휀퐵퐵,퐷퐷퐴퐴=4 퐷퐷퐵퐵, compute the ratio of the pressure drop through a to the pressure drop through b for a) very low reynolds numbers, and b) very high reynolds numbers. (4 points)