EXPERIMENTAL STUDY OF CONDENSATION OF HUMID AIR IN LAMINAR FLOW IN A VERTICAL CHANNEL

2017 ◽  
Vol 48 (5) ◽  
pp. 379-390
Author(s):  
V. Murali Krishna ◽  
V. Dharma Rao
Keyword(s):  
Experimental Study ◽  
Laminar Flow ◽  
Vertical Channel ◽  
Humid Air

Experimental study on characteristics of direct-current laminar-flow nitrogen plasma-jet

2014 ◽  
Vol 26 (9) ◽  
pp. 92005 ◽  
Author(s):  
向勇 Xiang Yong ◽  
余德平 Yu Deping ◽  
曹修全 Cao Xiuquan ◽  
姚进 Yao Jin
Keyword(s):  
Experimental Study ◽  
Laminar Flow ◽  
Direct Current ◽  
Plasma Jet ◽  
Nitrogen Plasma

Experimental Study for Data Validation Regarding the Flow Movement in Natural Convection in an Asymmetrical Heated Vertical Channel

2014 ◽  
Vol 659 ◽  
pp. 313-318 ◽  
Author(s):  
Andrei Burlacu ◽  
Vasilică Ciocan ◽  
Marina Verdeș ◽  
Cătălin George Popovici ◽  
Marius Costel Balan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Natural Convection ◽  
Particle Image ◽  
Single Channel ◽  
Size Variation ◽  
Vertical Channel ◽  
Heat Output ◽  
Piv Method ◽  
Physical Boundary ◽  
Zone Temperature

The present paper presents an experimental study, regarding the dynamics of movement in natural convection in an asymmetrically heated vertical channel. The channel was immersed in a tank filled with water at a temperature of 15 °C. The study focuses on one hand, on the radiated heat output from the heating plate, and on the other hand, on the thermo-physical boundary conditions from the inlet and the outlet of the channel. These aspects give great problems in natural convection if limited to a single channel as a field of study. The experimental study was conducted to validate numerical results, in similar conditions. The size variation of the recirculating zone, temperature and speed in the channel were analyzed through the PIV method (Particle Image Velocymetry) using the equipment provided by Dantec Dynamics and the analysis program "Dynamic Studio".

Effects of Roughness on Turbulent Flow in Microchannels and Minichannels

2008 ◽  
Author(s):  
Timothy P. Brackbill ◽  
Satish G. Kandlikar
Keyword(s):  
Experimental Study ◽  
Laminar Flow ◽  
Turbulent Flow ◽  
Roughness Parameter ◽  
Reynolds Numbers ◽  
Turbulent Regime ◽  
Roughness Effects ◽  
Relative Roughness ◽  
Roughness Elements ◽  
Moody Diagram

The effect of roughness ranging from smooth to 24% relative roughness on laminar flow has been examined in previous works by the authors. It was shown that using a constricted parameter, εFP, the laminar results were predicted well in the roughened channels ([1],[2],[3]). For the turbulent regime, Kandlikar et al. [1] proposed a modified Moody diagram by using the same set of constricted parameters, and using the modification of the Colebrook equation. A new roughness parameter εFP was shown to accurately portray the roughness effects encountered in laminar flow. In addition, a thorough look at defining surface roughness was given in Young et al. [4]. In this paper, the experimental study has been extended to cover the effects of different roughness features on pressure drop in turbulent flow and to verify the validity of the new parameter set in representing the resulting roughness effects. The range of relative roughness covered is from smooth to 10.38% relative roughness, with Reynolds numbers up to 15,000. It was found that using the same constricted parameters some unique characteristics were noted for turbulent flow over sawtooth roughness elements.

An Inverse Convection Problem

1989 ◽  
Vol 111 (1) ◽  
pp. 37-43 ◽  
Author(s):  
A. Moutsoglou
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Inverse Problems ◽  
Free Convection ◽  
Vertical Channel ◽  
System Of Equations ◽  
Flow And Heat Transfer ◽  
Ill Posed ◽  
Convection Problem ◽  
Sequential Function Specification

The nature of inverse problems in convective environments is investigated. The ill-posed quality inherent in inverse problems is verified for free convection laminar flow in a vertical channel. A sequential function specification algorithm is adapted for the semiparabolic system of equations that governs the flow and heat transfer in the channel. The procedure works very well in alleviating the ill-posed symptoms of inverse problems. The performance of a simple smoothing routine is also tested for the prescribed conditions.

Experimental Study of a Laminar Flow Solid Desiccant Dehumidifier Driven by a Low Temperature Heat Source

2016 ◽  
Vol 819 ◽  
pp. 361-365 ◽  
Author(s):  
Seung Jin Oh ◽  
Kyaw Thu ◽  
Muhammad Wakil Shahzad ◽  
Wongee Chun ◽  
Kim Choon Ng
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Laminar Flow ◽  
Heat Source ◽  
Silica Gel ◽  
Average Diameter ◽  
Hot Water ◽  
Dry Air ◽  
Temperature Heat ◽  
Adsorption Desorption

In this paper, an experimental study of a laminar flow solid desiccant dehumidifier has been presented. The cyclic steady state performance of adsorption-desorption processes was analyzed at various heat source temperatures and typical ambient humidity conditions in tropics. The desiccant dehumidification system consists of two beds filled with silica gel, two heat exchangers operating at 30 oC and 80 oC respectively, three humidity stations for measurement of the temperature and humidity conditions of the system and a blower to make airflow throughout the system. Type-RD silica gel of 0.3 mm average diameter was used as the working desiccant in the dehumidification system. This system has no moving parts rendering less maintenance compared with a rotary type. It is also energy-efficient means of dehumidification by adsorption process with low temperature heat source as compared to the conventional methods. As a result, it was observed the humidity ratio of inlet air is reduced from 24 g/kg of dry air to about 17 g/kg of dry air. Concomitantly, hot water at 80 oC is used to regenerate the adsorbent.

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