In a dishwasher, the design and configuration of the spray arms and water jets ensure that the dishes in the top rack still receive adequate water flow and cleaning, even when the bottom rack is loaded. Here's how it works:
Spray arm positioning: Dishwashers typically have two spray arms—one positioned at the bottom and one at the top. The spray arms are equipped with small openings or nozzles that release pressurized water during the wash cycle.
Rotating spray arms: The spray arms are designed to rotate during the wash cycle. This rotation creates a spraying motion, distributing water and detergent throughout the dishwasher.
Water pressure and jets: The dishwasher's water pump provides sufficient pressure to propel water through the spray arm nozzles. The water jets shoot out from the nozzles in a focused manner, targeting specific areas within the dishwasher.
Spray arm coverage: The positioning and angle of the spray arms are designed to provide comprehensive coverage to both the bottom and top racks. The water sprayed from the lower spray arm reaches the dishes in the bottom rack, while the water sprayed from the upper spray arm reaches the dishes in the top rack.
Water flow dynamics: The water jets create a turbulent flow of water inside the dishwasher. This turbulent flow helps circulate water throughout the dishwasher cavity, ensuring that the water reaches all areas, including the top rack.
Load placement considerations: To optimize cleaning performance, it's important to load the dishwasher correctly. By avoiding overcrowding and strategically placing dishes with concave surfaces facing downward, you can maximize water circulation and ensure that all dishes receive proper cleaning.
By combining the rotating spray arms, water pressure, targeted jets, and careful load placement, dishwashers are designed to overcome the obstacles posed by the lower rack and ensure effective cleaning of dishes in both the top and bottom racks.