EXPERIMENTAL STUDY OF THERMO-HYDRAULIC PERFORMANCE OF SWCNT NANOFLUIDS IN SINGLE-PHASE FLOW

A systematic and accurate experimental investigation of friction factor in the transition region for single phase flow in mini- and micro-tubes has been performed for eight stainless steel tubes with diameters ranging from 2083 μm to 667 μm. The pressure drop measurements were carefully performed by paying particular attention to the sensitivity of the pressure-sensing diaphragms used in the pressure transducer. Experimental results indicated that the start and end of the transition region was influenced by varying the tube diameter. The friction factor profile was not significantly affected for the tube diameters between 2083 μm and 1372 μm. However, the influence of the tube diameter on the friction factor profile became noticeable as the diameter decreased from 1372 μm to 667 μm.

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Experimental Study and Numerical Analysis of Water Single-Phase Pressure Drop Across a Micro-Pin-Fin Array

2010 14th International Heat Transfer Conference, Volume 3 ◽

10.1115/ihtc14-23171 ◽

2010 ◽

Cited By ~ 4

Author(s):

Christopher A. Konishi ◽

Ruey Hwu ◽

Weilin Qu ◽

Frank E. Pfefferkorn

Keyword(s):

Experimental Data ◽

Experimental Study ◽

Numerical Analysis ◽

Single Phase ◽

Inlet Temperature ◽

Equivalent Diameter ◽

Phase Flow ◽

Single Phase Flow ◽

Pin Fin ◽

Pin Fin Array

This study investigates the hydraulic performance of a copper micro-pin-fin array subjected to water liquid single-phase flow conditions. The test section contains an array of 1950 staggered square micro-pin-fins with 200 micron × 200 micron cross-section by 670 micron height. The ratios of longitudinal pitch and transverse pitch to pin-fin equivalent diameter are equal to 2. Seven water inlet temperatures from 22°C to 80°C, and seventeen maximum mass velocities for each inlet temperature, ranging from 181 to 1649 kg/m2s, were tested. The test module was well insulated to maintain adiabatic conditions. Comparison of predictions of eleven existing friction factor correlations with the experimental data show relatively large discrepancies. The experimental study was complemented with a numerical analysis of single-phase flow in the micro-pin-fin array. Numerical results show excellent agreement with experimental data for Reynolds numbers below 700.

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Experimental Study of Single Phase Flow in a Closed-Loop Cooling System with Integrated Mini-Channel Heat Sink

Entropy ◽

10.3390/e18060128 ◽

2016 ◽

Vol 18 (6) ◽

pp. 128 ◽

Cited By ~ 7

Author(s):

Lei Ma ◽

Xuxin Zhao ◽

Hongyuan Sun ◽

Qixing Wu ◽

Wei Liu

Keyword(s):

Experimental Study ◽

Heat Sink ◽

Single Phase ◽

Closed Loop ◽

Cooling System ◽

Phase Flow ◽

Single Phase Flow

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Modeling the influence of forming fabric structure on vacuum box dewatering

TAPPI Journal ◽

10.32964/tj16.8.477 ◽

2017 ◽

Vol 16 (08) ◽

pp. 477-483 ◽

Cited By ~ 1

Author(s):

Bjorn Sjostrand ◽

Christophe Barbier ◽

Lars Nilsson

Keyword(s):

Experimental Study ◽

Single Phase ◽

Numerical Models ◽

High Vacuum ◽

Phase Flow ◽

Single Phase Flow ◽

Two Phase ◽

Vacuum Suction ◽

Fabric Structure ◽

Fabric Structures

This investigation used numerical models to describe forming section sheet dewatering at the high vacuum suction boxes. Three different fabric structures were examined with numerical models for single-phase flow of air and for two-phase flow of air and water. This was done to evaluate how forming fabric structure influences sheet dewatering. The numerical models were compared with an experimental study of the same fabrics investigated on a laboratory suction box. The small differences in dewatering rate in the experimental study could be simulated with the models, which confirmed the validity of the models. This implies that these numerical models can be used to describe new fabrics and how they will respond in the papermaking process.

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