Heat transfer enhancement by silver nanowire suspensions in microchannel heat sinks

Coskun, Sahin
Ünalan, Hüsnü Emrah
Convection heat transfer and pressure drop characteristics of water based silver nanowire suspensions flowing through CMOS compatible monolithic microchannel heat sinks are investigated experimentally. Three different rectangular channels of 200 mu m x 50 mu m, 100 mu m x 50 mu m and 70 mu m x 50 mu m cross sectional area are used during the experiments. The stability of the silver nanofluids is established by the added polyvinylpyrrolidone (PVP) as the surfactant. To investigate the potential heat transfer enhancement by the silver nanofluids, the experiments are performed with deionized (DI) water, PVP-DI water solution, and the silver nanofluid with added PVP. It is observed that the silver nanofluid had higher heat transfer coefficient than both the PVP-DI water solution, and DI water only. Moreover, all fluids have similar hydrodynamic performance. The prepared silver nanofluid sample is a successful example of a stable nanofluid that has very little surfactant such that the existence of the surfactant does not cause a decrease in the heat transfer coefficient, while maintaining the stability. Upto 56% enhancement in the heat transfer coefficient is reached with practically no increase in the pumping power. The study is the first in using silver nanowire suspensions for heat transfer enhancement. (C) 2017 Elsevier Masson SAS. All rights reserved.


Heat transfer and pressure drop experiments on CMOS compatible microchannel heat sinks for monolithic chip cooling applications
Koyuncuoglu, Aziz; Jafari, Rahim; Okutucu-Ozyurt, Tuba; Külah, Haluk (2012-06-01)
Novel CMOS compatible microchannel heat sinks are designed, fabricated and tested for monolithic liquid cooling of integrated circuits. The proposed heat sink is fabricated by low temperature surface micromachining processes and requires no design change of the electronic circuitry underneath, hence, can be produced by adding a few more steps to the standard CMOS fabrication flow. The microchannel heat sinks were tested successfully under various heat flux and coolant flow rate conditions. The cooling tests...
Performance analysis of grooved heat pipes using 3-D multi-channel thermal resistance network
Sezmen, Ramazan Aykut; Dursunkaya, Zafer; Çetin, Barbaros; Department of Mechanical Engineering (2021-9)
Heat pipes are phase change heat transfer devices that transfer high amounts of heat with low temperature differences compared to conventional cooling techniques due to their high thermal conductivity. Since heat pipes do not require any external power supply and not involve any moving parts, they are preferred for high reliability applications and in wide range of industrial applications from thermal management of electronics to space applications. Essentially, heat pipes use the advantage of occurring pha...
Experimental investigation of single phase liquid flow and heat transfer in multiport minichannels
Altınöz, Mesru; Güvenç Yazıcıoğlu, Almıla; Baker, Derek Keıth; Department of Mechanical Engineering (2013)
This thesis aims to experimentally investigate pressure drop and heat transfer characteristics of single phase water flow in rectangular minichannels. The small channels are an area of interest in heat transfer field since 1970’s owing to their enhanced heat transfer characteristics. However, the heat transfer and pressure drop characteristics of these channels are not fully established as there is a wide number of studies in literature showing inconsistent results with each other. In order to investigate t...
Heat Transfer for the Film Cooled Vane of a 1 1 2 Stage High Pressure Transonic Turbine Part I Experimental Configuration and Data Review With Inlet Temperature Profile Effects
Kahveci, Harika Senem; MATHISON, RANDALL; DUNN, MICHAEL (2011-01-01)
This paper investigates the vane airfoil and inner endwall heat transfer for a full-scale turbine stage operating at design corrected conditions under the influence of different vane inlet temperature profiles and vane cooling flow rates. The turbine stage is a modern 3-D design consisting of a cooled high-pressure vane, an un-cooled high-pressure rotor, and a low-pressure vane. Inlet temperature profiles (uniform, radial and hot streaks) are created by a passive heat exchanger and can be made circumferenti...
Heat transfer in ultra-high temperature advanced ceramics under high enthalpy arc-jet conditions
Cecere, Anselmo; Savino, Raffaele; Allouis, Christophe Gerard; Monteverde, Frederic (2015-12-01)
Aim of this work is to analyze the response of an ultra-high temperature ceramic at typical heat flux conditions of thermal protection systems of a re-entry spacecraft. In particular, a ZrB2-SiC based ultra-high temperature advanced ceramic sharp leading edge demonstrator (1 mm nominal radius of curvature) was manufactured and tested in a non-equilibrium high enthalpy supersonic airflow, 20 MJ/kg of peak total enthalpy, by using an arc-jet ground facility. The surface temperature of the leading edge was mon...
Citation Formats
E. SIMSEK, S. Coskun, T. OKUTUCU-OZYURT, and H. E. Ünalan, “Heat transfer enhancement by silver nanowire suspensions in microchannel heat sinks,” INTERNATIONAL JOURNAL OF THERMAL SCIENCES, pp. 1–13, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47267.