curvature ratio and pitch spacing effect of helical coiled tube on pressure drop and heat transfer behavior of tio2/water nanofluid laminar flow

Authors

مصطفی کاهانی

سعید زینالی هریس

سیدمحمود موسوی

abstract

in the present study the effect of curvature ratio and coil pitch for tio2/water nanofluid laminar flow on heat transfer behavior and pressure drop through helical coils with different geometries was investigated experimentally. the tio2/water nanofluids at 0.25% to 2% particle volume concentrations have been prepared by using a two-step method. the experiments were performed for coils with curvature ratio of 10 and 20 and coil pitch of 24 and 42. based on the experimental data, it is found that the nusselt number as well as reynolds number improves while increasing particle volume concentration. this enhancement is due to the higher effective thermal conductivity of nanofluid and also intensification of nanoparticles. besides, increase in density and viscosity of nanofluid compared to the base fluid leads to a pressure drop increment for flow through helical coiled tube. furthermore, the heat transfer rate improves with the increase of pitch coils and decrease of curvature ratio. additionally, curvature ratio shows more significant effect on nusselt number and pressure drop than pitch spacing. 42.1% enhancement on nusselt number is obtained for the nanofluid with 2% volume concentarion in comparison to the base fluid. finally, it is shown that the experimental results and predicted results of nusselt number and pressure drop for nanofluid flow through helical coils hold reasonable agreement.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Comparison of convective heat transfer of turbulent nanofluid flow through helical and conical coiled tubes

Application of nanofluid and coiled tubes are two passive methods for increasing the heat transfer. In the present study, the turbulent flows of water and nanofluid in coiled tubes heat exchanger were numerically studied. CuO-water nanofluid containing 1 vol% copper oxide nanoparticles was used and single-phase approach was considered for nanofluid flow. The effect of different geometrical para...

full text

Experimental investigation on heat transfer and pressure drop of Al2O3-base oil nanofluid in a helically coiled tube and effect of turbulator on the thermal performance of shell and tube heat exchanger

These days With respect to the high importance of energy concept, limitation of natural resources, regulation of environmental issues, and global warming, heat transfer systemschr(chr('39')39chr('39')) applications get more attention. In the present paper, the experimental effect of Nano-fluid and turbulator on the heat transfer and pressure drop is investigated. AL2O3-SN300 base oil as nanoflu...

full text

Modeling of TiO2-water Nanofluid Effect on Heat Transfer and Pressure Drop

This paper reports a numerical study on the force convection heat transfer and flow characteristics of a nanofluid containing water and Tio2 with various volume fractions (0.002

full text

Effect of Al2O3-water nanofluid on heat transfer and pressure drop in a three-dimensional microchannel

The fluid flow and heat transfer in a three-dimensional microchannel filled with Al2O3- water nanofluid is numerically investigated. The hybrid scheme is used to discretize the convection terms and SIMPLER algorithm is adopted to couple the velocity and pressure field in the momentum equations. The thermal and flow fields were analyzed using different volume fractions of n...

full text

Effect of Al2O3-water nanofluid on heat transfer and pressure drop in a three-dimensional microchannel

The fluid flow and heat transfer in a three-dimensional microchannel filled with Al2O3- water nanofluid is numerically investigated. The hybrid scheme is used to discretize the convection terms and SIMPLER algorithm is adopted to couple the velocity and pressure field in the momentum equations. The thermal and flow fields were analyzed using different volume fractions of n...

full text

My Resources

Save resource for easier access later


Journal title:
علوم کاربردی و محاسباتی در مکانیک

جلد ۲۵، شماره ۱، صفحات ۱۸-۰

Keywords

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023