You are the only fluid mechanics engineer in a logistic department of a company which manage...

 

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You are the only fluid mechanics engineer in a logistic department of a company which manage a huge fleet of trucks that transport medium-size furniture around the country. The company has a project to transport 5120 refrigerators to a destination of 540 km distance all within one day. There are three types of trucks available: small truck, medium truck and big truck. The specifications for the trucks are shown in TABLE Q1 below. Take the density of and dynamic viscosity of ambient air as 1.2 kg/m³ and 1.80 X 105 Pa.s, respectively. The truck uses diesel which the heating value is 45 000 kJ/kg and density 0.832 kg/L The average speed of truck during the journey is 90 km/h. The diesel fuel is cost at RM 1.95/L. As an engineer, make a proposal that includes drag forces analysis, assumptions and finally propose the optimum solution of the arrangement of trucks to complete the project. TABLE Q1: Specifications of Company Trucks Small Truck Medium Truck Specification Width (m) Height (m) Length (m) Overall engine efficiency (%) Pressure drag coefficient Maximum Capacity (Number of refrigerators per truck) 1.8 2.3 4.7 31 0.79 16 2.3 3.1 9.1 34 0.83 32 Big Truck 2.8 4.1 13.6 36 0.89 64 [30 marks] You are the only fluid mechanics engineer in a logistic department of a company which manage a huge fleet of trucks that transport medium-size furniture around the country. The company has a project to transport 5120 refrigerators to a destination of 540 km distance all within one day. There are three types of trucks available: small truck, medium truck and big truck. The specifications for the trucks are shown in TABLE Q1 below. Take the density of and dynamic viscosity of ambient air as 1.2 kg/m³ and 1.80 X 105 Pa.s, respectively. The truck uses diesel which the heating value is 45 000 kJ/kg and density 0.832 kg/L The average speed of truck during the journey is 90 km/h. The diesel fuel is cost at RM 1.95/L. As an engineer, make a proposal that includes drag forces analysis, assumptions and finally propose the optimum solution of the arrangement of trucks to complete the project. TABLE Q1: Specifications of Company Trucks Small Truck Medium Truck Specification Width (m) Height (m) Length (m) Overall engine efficiency (%) Pressure drag coefficient Maximum Capacity (Number of refrigerators per truck) 1.8 2.3 4.7 31 0.79 16 2.3 3.1 9.1 34 0.83 32 Big Truck 2.8 4.1 13.6 36 0.89 64 [30 marks]