Studi Eksperimental Perpindahan Kalor Konveksi Fluida Nano Al2o3-Prophylene Glycol Pada Circular Tube Di Bawah Kondisi Fluks Kalor Konstan
Abstract: This research was
conducted to examine the thermal conductivity and heat transfer characteristic
of Al2O3-prophylene glycol nanofluid on a circular tube heat exchanger under
constant heat flux conditions. Al2O3 nanoparticles with nominal diameter of 13
nm were dispersed in prophylene glycol as base fluid at three different
particles concentration of 0,2%, 0,5%, and 1,0% w/v, respectively. A straight
horizontal stainless-steel tube of 1,2 m length, 0,005 m inner diameter and
0,0063 m outer diameter was used as a test section. A nickelin coil heater was
connected to an AC regulated power supply to obtain constant wall heat-flux
boundary condition. The flow rates were adjusted to obtain the Reynolds number
specification from 75 to 215. The result shows that the effective thermal
conductivity increases from its base fluid. The highest enhancement of thermal
conductivity of the observed nanofluids is 4,80% for nanoparticles
concentration of 1,0% w/v. For the same Reynolds number, heat transfer
increases with the increase of the Nusselt number from base fluid to nanofluids
at x/Di = 200 with the highest value of 27,61% for 1,0% w/v. At the Reynolds
number variation, the highest Nusselt number enhancement at x/Di = 200 reaches
43,49% from Reynolds number 75 to 215 for alumina concentration of 1,0% w/v.
Keywords: Heat transfer
coefficient, Nanofluids, Particle concentrations, Thermal conductivity, Al2O3
nano particle
Penulis: Endra Dyatmika Karna,
Budi . kristiawan, Eko Prasetya Budiana
Kode Jurnal: jptmesindd140497
