EXPERIMENTAL INVESTIGATION OF SINGLE-PHASE LIQUID FLOW AND HEAT TRANSFER IN MULTIPORT MINICHANNELS

Date

2014-08-07

Author

Altinoz, Mesru
Güvenç Yazıcıoğlu, Almıla
Baker, Derek Keıth

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

158
views

0
downloads

Small channels have been an area of interest since the 1970s owing to their enhanced heat transfer characteristics. However a wide number of studies in literature show inconsistent results. In this work, an experimental set-up has been designed and constructed to investigate pressure drop and heat transfer characteristics of single-phase water flow in rectangular multiport minichannels. Laminar flow inside three minichannels with different hydraulic diameters and different port numbers were examined under a constant heat flux boundary condition. The results are presented in terms of Poiseuille number (Po) and average Nusselt number (Nu). Generally, average Nusselt number results and Poiseuille number results showed good agreement with constant Po theory and constant (Nu) over bar theory, excluding developing effects and experimental errors. On the other hand, developing effects are found to be increasing as hydraulic diameter decreases. Similarly, constant (Nu) over bar value showed a decrease with increasing hydraulic diameter. The experimental results are compared with conventional correlations. While the agreement with conventional correlations is satisfactory, the predictions of the correlations overestimated most of the results. No early transition was observed for Reynolds number (Re) smaller than 1800.

Subject Keywords

Rectangular Microchannels, Friction

URI

https://hdl.handle.net/11511/55480

Conference Name

12th International Conference on Nanochannels, Microchannels and Minichannels (ICNMM)

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Overall shape of sintered alumina compacts Özkan, Necati (1997-01-01) The extent of the thermally induced shrinkage during sintering of nominally homogeneous ceramic compacts depends upon the green density; compacts with a low green density shrink more than those with a higher density. Therefore, shape distortions of compacts with variable density during their sintering is inevitable. The overall shapes of various sintered alumina compacts, prepared using different types of alumina agglomerates, is described. The agglomerates were prepared using organic polymer [poly(vinyl al...
Experimental based numerical investigation of microchannel condenser integrated freezers Dinçer, Seren; Okutucu Özyurt, Hanife Tuba; Department of Mechanical Engineering (2019) The recent developments in the production techniques enable the use of mini/micro channel heat exchangers in household refrigerators. This led refrigeration companies to evaluate the impact of the use of microchannel heat exchangers theoretically and experimentally in household refrigerator units. This study aims to implement the microchannel condenser in a frost-free freezer as a replacement of macro scale coil type condenser. Microchannel condenser used in this study has 0.846 mm hydraulic diameter. Energ...
Experimental Investigation of Uninterrupted and Interrupted Microchannel Heat Sinks SOYSAL, Ayse Gozde Ulu; Sert, Cüneyt; Yazicioglu, Almila Guvenc (2013-09-27) In this work, the relation between heat transfer performance and interruption of microchannels was investigated. Experiments were conducted on uninterrupted and interrupted aluminium channel heat sinks of different channel widths. Two different types of interrupted channels were tested: channels having single interruption and 7 interruptions. Distilled water was used to remove a constant heat load of 40 W in the volumetric flow rate range of 0.5-1.1 lpm. The interruption of channels improved the thermal per...
Detailed simulations of parabolic trough collector for investigating enhancement of heat transfer to absorber tube flow Uygur, Sinan; Tarı, İlker; Department of Mechanical Engineering (2021-2-12) In this thesis, a detailed method to simulate heat transfer and fluid flow of parabolic trough solar collectors is presented. An optical model of the considered collector is created with Tonatiuh ray tracing program. The data of ray tracing analysis is exported to MATLAB as a binary file for post-processing. Curve fitting and surface fitting to the data are performed to obtain the heat flux distribution on the absorber tube’s outer surface. User-defined functions (UDFs) for ANSYS Fluent Computational Fluid ...
Coaxial silver nanowire network core molybdenum oxide shell supercapacitor electrodes Yuksel, Recep; Coskun, Sahin; Ünalan, Hüsnü Emrah (Elsevier BV, 2016-03-01) We present a new hybrid material composed of molybdenum (IV) oxide (MoO2) shell on highly conducting silver nanowire (Ag NW) core in the network form for the realization of coaxial Ag NW/MoO2 nanocomposite supercapacitor electrodes. Ag NWs were simply spray coated onto glass substrates to form conductive networks and conformal MoO2 layer was electrodeposited onto the Ag NW network to create binder-free coaxial supercapacitor electrodes. Combination of Ag NWs and pseudocapacitive MoO2 generated an enhanced e...

Citation Formats

M. Altinoz, A. Güvenç Yazıcıoğlu, and D. K. Baker, “EXPERIMENTAL INVESTIGATION OF SINGLE-PHASE LIQUID FLOW AND HEAT TRANSFER IN MULTIPORT MINICHANNELS,” presented at the 12th International Conference on Nanochannels, Microchannels and Minichannels (ICNMM), Chicago, IL, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55480.