Abstract
Regenerative flow pumps are kinds of dynamic pumps with the ability to develop high heads at low flow rates. Despite the disadvantage of having low hydraulic efficiency, regenerative flow pumps have found many applications in industries. In this paper, the effect of fluid viscosity on the performance of regenerative pump has been investigated experimentally. The primary fluid was water with viscosity of 1 centipoise. Polyacrylamide (PAM) which is a soluble polymer in water was used to increase the viscosity of fluid. Solutions prepared from dry powder PAM at two concentrations of 1600 ppm and 2400 ppm. Solutions were pumped more than 30 times to have homogeneous fluids. The measured viscosities for these two solutions were 180 and 300 centipoise respectively. Results showed that as flow coefficient reduces, the decline in head coefficient gradually increases. Similarly, it was found that viscosity enhancement reduces the power coefficient. There was not any significant change in efficiency curves at low flow coefficients. In contrast, around design flow coefficient and at high flow coefficients, the hydraulic efficiency of the pump reduced by increasing viscosity of working fluid. DOI: http://dx.doi.org/10.5755/j01.mech.23.6.16204
Highlights
Regenerative flow pumps are types of dynamic pumps with the ability to develop high heads at low flow rates
Solutions prepared from dry powder PAM at two concentrations of 1600 ppm and 2400 ppm
The flow coefficient (φ), head coefficient (ψ), power coefficient (τ) and hydraulic Efficiency (η) which is defined as the ratio between the hydraulic power transferred to the working fluid and the mechanical power introduced into the system by the impeller [13]
Summary
Regenerative flow pumps are types of dynamic pumps with the ability to develop high heads at low flow rates. They have very low specific speed and can replace the positive displacement pumps without any wear and lubrication problems. Regenerative Pumps are better choice than other types of centrifugal pumps at low specific speeds [1]. Regenerative pumps capable of generating heads equivalent to that of several centrifugal stages with comparable tip speeds. RFPs have compact design and they are very cheap to manufacture. They present performance curve with very stable features [2]. Despite the disadvantage of having low hydraulic efficiency (30-50%), regenerative pumps have found many applications in industries including automotive and aerospace fuel pumping, booster systems, water supply, agricultural industries, shipping and mining, chemical, and food processing systems [3]
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