a. A decanter is used to separate oil droplets from a liquid-liquid mixture flowing at a rate of 4 kg/s for oil and 16 kg/s for seawater. Assuming the oil is dispersed in the seawater, design a decanter to separate the mixture in a horizontal drum. By specifying the ratio of length to diameter, estimate the dimensions of the drum. The length and diameter of the drum must not be NOT equal. Draw a schematic to illustrate your answer. State ALL assumptions used with justification. Provide the source of data of additional information or equation used, if any. [20 marks)