Theoretical research on flow characteristic of urban sewage

Abstract:

In order to extend the utilization of urban sewage in sewage heat pump system,based on the urban sewage which is the flow working fluid in untreated sewage heat pump system,characteristics of laminar flow and turbulent flow were studied in theoretical derivation and experimental analysis.The results show that the urban sewage has the shear-thinning characteristic in rheology,so the generalized Reynolds number can be used to determine the flow pattern.The pressure loss equations under laminar and turbulent flow conditions were deduced theoretically and verified by experiment.The research results are favourable for pump choose of untreated sewage heat pump system.