Physico-Acoustic Study on Thermal Conductivity of Silver Nanofluid

Low transmission of heat is one of the major problems for heat exchanger fluids in many industrial and scientific applications. This includes cooling of the engines, high power transformers to heat exchangers in solar hot water panels or in refrigeration systems. In order to meet these problems in thermal industries, nanofluids can have a significant role as excellent heat exchanger materials for thermal applications. Silver nanofluids can be used abundantly for thermal applications due to their low cost and high thermal conductivity. The present paper describes the green synthesis of silver nanoparticles from AgNO۳ powder using some plant product like tannic acid. The silver nanoparticles are characterized by XRD, UV-visible spectrophotometer, TEM. The silver nanofluids of different concentrations are prepared using water as base fluid. The ultrasonic velocity is calculated for different concentration at room temperature. Acoustical parameters like compressibility, intermolecular free length and acoustic impedance are calculated using ultrasonic velocity, density and viscosity and the results are discussed in terms of intermolecular interactions between the nanoparticles and base fluid. The variation of ultrasonic velocity and other calculated acoustic parameters are used to analyse in amplification of heat conductivity of silver nanofluids.

کلیدواژه ها:

Nanofluids ، Ultrasonic velocity ، Acoustic parameter ، Thermal conductivity