In this study, for the first time, the heat transfer and the pressure drop of zinc oxide nanoparticles in alternating elliptical axis (AEA) tube have been investigated experimentally. The zinc oxide nanoparticles were at volumetric concentrations 1% and 2%. The base fluid was heat transfer oil and the experiments were conducted at constant wall temperature. Also, the study was done in Reynolds ...

The potential of nanofluids for the improvement of heat transfer coefficient in various heat exchangeequipment has been considered and studied as a major application during recent decades. In this research,heat transfer coefficient of ZnO, TiO2 and ZnO/TiO2 nanofluids in a shell and tube heat exchanger has beenstudied experimentally. ZnO nanoparticle was synthesized through pre...

The hydrodynamics of an internal-loop airlift reactor was numerically and experimentally characterized. gas holdup, liquid velocity, shear rate, flow pattern volumetric oxygen transfer coefficient (kLa) were evaluated as a function the air velocity medium rheology. Tap water CMC solutions used Newtonian non-Newtonian fluids, respectively. standard  model employed for modeling turbulence, uns...

In rotating biological contactors (RBC), the oxygen mass transfer coefficient (KLa) is often inadequately predicted by the available models. Hence, dimensional analysis based empirical models were developed for predicting KLa and the component of KLa due to turbulence (KLat) using data available in the literature. The overall oxygen transfer number (OTN) and its component due to turbulence (OTN...

In conventional intermittent hemodialysis, the overall mass transfer coefficient (Kd) of a dialyser is mostly calculated at zero ultrafiltration and at relatively high dialysate flow rates. In continuous arterio-venous hemodiafiltration (CAVHD), the dialysate flow rates are low as comparable to the rates of ultrafiltration flows, making the dialysis treatment as slow as possible. Therefore the ...

In this study, hydrodynamics and physiology of microorganisms were investigated in a new type membrane bioreactor, MHCR, which is a membrane coupled HCR (High performance Compact Reactor) having very high COD removal efficiency. The degree of interference caused by inserting a submerged membrane was evaluated quantitatively by measuring the air suction rate and overall oxygen transfer coefficie...

The enhancement of mass transfer is very important in CO2 absorption, and a rotating zigzag bed (RZB) promising device to intensify the gas–liquid efficiency. In this study, characteristics an RZB relation overall gas-phase volumetric mass-transfer coefficient (KGa) were investigated with CO2–NaOH system. A mathematical model was established illustrate mechanism irreversible pseudo-first-order ...