Comparative Thermal Performance Analysis on Helical Screw Insert in Tube With Number of Strips With Nanofluid at Laminar Flow Regime

Abstract

The experimental analysis is arranged to evaluate the thermal hydraulic performance on nanofluid flow in helical screw insert with tube at a number of strips and different twist ratios in laminar flow regime. The single strip (SS) helical screw inserts are also compared with the double strip (DS) helical screw inserts. The heat transfer enhancement is achieved with nanofluid flow in double strip as compared with single strip helical screw insert at decreased values of twist ratio and increased values of Reynolds number. A maximum enhancement of 421% is found in the value of Nusselt number with double strip helical screw insert at twist ratio of 1.5 and low value of Reynolds number in the flow of nanofluid than water in plain tube. The common correlations of Nusselt number and friction factor are generated. The thermal performance factor (TPF) is achieved at a maximum value of 2.42 with double strip than single strip helical screw inserts at twist ratio of 2.5 and low value of Reynolds number. The present analysis shows suitability of the double strip helical screw insert to enable miniaturization of the heat exchangers. A compact heat exchanger decreases the size of thermal application such as solar water heater, solar power plants, electronic cooling systems, radiator, etc., which could save environment by pollution reduction with utilization of energy.

Investigating different types of fluids in pulsating heat pipes for improving heat transfer in an air-cooled heat exchanger

“…26,27 In our case study, the temperature range in the natural gas compressor outlet was 40-100°C, and after cooling, the temperature had to be less than 50°C. Previous studies [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] on PHPs at similar temperature ranges showed that R134a, R 22, and acetone could be applied in the present study.…”

“…Another survey by Burlacu et al in 2018 16 improved 30% thermal performance by using a heating pipe system in a building installation. Chaurasia and Sarviya 19 arranged and analyzed an experimental system to evaluate thermal-hydraulic performance on the flow of fluid in the tube with helical screw inserts at numbers of strips and different values of twist ratio at transition flow regime. Their results showed that double strip helical screw inserts show suitability for miniaturization of the heat exchanger, which could be beneficial for efficient thermal applications as solar water heaters, electronic cooling devices, automobile radiators, power plants, etc.…”

“…Recently, different experiments have been carried out to use PHP in industries. [13][14][15][16][17][18][19][20][21][22][23][24] The innovation of the current paper is the design of a laboratory system through creating similar boundary conditions in a natural gas compressor station. In the natural gas transmission industry, the natural gas temperature is reduced by the use of ACHE; therefore, in this study, for the first time, similar conditions were established in the laboratory system, and laboratory testing was conducted at different velocities of inlet fluid, cooling fan system, and tubes.…”

“…Various measuring devices were further installed to measure the required parameters. 19 Finned tubes are typically used in ACHEs, hence the ability of the laboratory system to generate both process and cooling conditions. Therefore, it was necessary to design a system that could increase the temperature of the process fluid to the desired conditions and then perform the cooling operation.…”

Heat transfer enhancement with channel surface roughness: A comprehensive review

“…The dispersion of these nanometer-sized particles into the conventional fluid improves the HT characteristics of the fluid, and such fluids are termed nanofluids (NFs). 22,23 The nanoparticles (NPs) can be of metals, non-metals, metal oxides, etc., but must have k higher than that of the base fluid (BF). 24 The NF can be prepared by suspending the NPs into the BF.…”