Final answer:
The question relates to verifying if the flow of concrete is laminar and does not provide information on mixing times. It involves advanced engineering concepts like fluid dynamics, and hence, an analysis would require using the Hagen-Poiseuille equation and knowledge of concrete's viscosity, hose resistance, and power calculations.
Step-by-step explanation:
The question posed concerns how to determine whether the flow of concrete is laminar in nature when it is pumped through a long hose at specific flow rates and pressures. No information regarding the mixing time of concrete in a portable mixer is provided.
However, to answer the engineering-related calculations, we would need to use principles of fluid dynamics, specifically the Hagen-Poiseuille equation, which pertains to the laminar flow of fluids through pipes. Additionally, calculations involving concrete's viscosity, the resistance of the hose, and the power supplied by the pump in this scenario must consider various physical properties such as the fluid's density and viscosity, and the dimensions of the hose.
To calculate the flow as laminar, we use the Reynolds number, which requires knowledge of concrete's viscosity, density, flow rate, and hose dimensions. A Reynolds number below 2000 typically indicates laminar flow. To calculate the resistance of the hose and the power supplied by the pump while assuming laminar flow, we can use both the Hagen-Poiseuille law and power formula P=∆P*Q, where ∆P is the pressure difference and Q is the volumetric flow rate.