I’d like to ask fellow users: how is the loss head calculated for this problem?

The formula for calculating the head loss is: hf = f * (L/D) * (V^2/2g), where hf represents the head loss per unit length, f is the friction coefficient, L is the length of the pipe, D is the equivalent diameter, V is the flow velocity, and g is the acceleration due to gravity. The formula for calculating the equivalent diameter is: De = 4A/P, where De represents the equivalent diameter, A is the cross-sectional area of the pipe, and P is the perimeter of the pipe. Therefore, when calculating the loss head, it is necessary to first determine the equivalent diameter of the pipe. For the 211 tubes in the specific problem, the equivalent diameter of each tube can be calculated based on factors such as the actual size and shape of the tubes as well as the fluid medium, and then this value can be used in the formula for calculating the pressure loss. If the result differs from the reference answer, it may be necessary to check whether the parameters or formulas used in the calculations are correct, or to consider whether there are other factors that have not been taken into account and are causing the discrepancy. .

Thank you! I calculated it to be 0.55 meters. Here, it mainly involves 211 tubes; is it sufficient to calculate the pressure drop per tube?

The material flows inside the pipe. Since the actual inner diameter of each tube is 33 mm, it can be calculated directly; there’s no need for an equivalent diameter. If 211 are calculated together, how is the equivalent diameter determined?