Similarity of temperature and concentration field in Poiseuille–Benard channel flow

A flow over hot water film in horizontal channel (Poiseuille–Benard flow) is studied experimentally and by means of CFD. Averaged temperature and concentration fields were measured in central transverse plane using RTD and capacitive humidity probe for different Ri = Gr/Re2. A similarity of thermal and concentration field is discussed and the influence of thermal and humidity field by radiative heat transfer is investigated since it has a considerable effect. Same cases are modeled by CFD in commercial code Star-CCM+. Simulated thermal and concentration fields shows similar character as those from measurements when radiative heat transfer mode is considered.

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Radiative Heat Transfer and Fluorescence Measurements in Laminar Prevaporized Canola Methyl Ester/Diesel Blend Flames

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4030701 ◽

2015 ◽

Vol 8 (1) ◽

Cited By ~ 1

Author(s):

V. Singh ◽

R. N. Parthasarathy ◽

S. R. Gollahalli

Keyword(s):

Heat Transfer ◽

Methyl Ester ◽

Radiative Heat Transfer ◽

Gas Turbines ◽

Internal Combustion Engines ◽

Radiative Heat ◽

Concentration Field ◽

Gaseous Species ◽

Flame Radiation ◽

Fluorescence Measurements

Biofuels, such as canola methyl ester (CME), continue to receive considerable attention for their potential use as alternatives to petroleum diesel fuel. The studies on the application of biofuels in internal combustion engines, in general, have shown a considerable reduction in carbon monoxide (CO), soot, and radiative heat emissions, and a small increase in NOx emissions. Radiative heat transfer from flames, which is important in applications such as gas turbines and glass-manufacturing furnaces, has received little attention. The objective of this investigation was to document radiative heat transfer and radical and gas concentration measurements to understand the dominant mechanism of heat transfer in CME/diesel blend flames. In order to isolate the fuel chemical effects on the combustion characteristics of fuels, laminar flames of prevaporized liquid fuels were studied at injector-exit equivalence ratios of 1.2, 2, 3, and 7. Measurements of radiative heat transfer and flame structure including OH and CH radical concentration field were completed. While the peak temperatures in the various blend flames were comparable at the same equivalence ratio, the total flame radiation decreased with the increase in CME concentration in the fuel. Estimates of radiation from gaseous species and soot indicated that about 27–30% of the radiation was from gases, and the rest from soot. The gaseous species contribution to the flame radiation increased slightly with the biofuel content in the blend.

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Experimental research of radiative heat transfer in a water film

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2017.10.082 ◽

2018 ◽

Vol 117 ◽

pp. 1075-1082 ◽

Cited By ~ 7

Author(s):

G.V. Kuznetsov ◽

K.Yu. Osipov ◽

M.V. Piskunov ◽

R.S. Volkov

Keyword(s):

Heat Transfer ◽

Experimental Research ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Water Film

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Inverse Analysis of Radiative Heat Transfer Systems

Journal of Heat Transfer ◽

10.1115/1.2826005 ◽

1999 ◽

Vol 121 (2) ◽

pp. 481-484 ◽

Cited By ~ 11

Author(s):

M. R. Jones

Keyword(s):

Heat Transfer ◽

Radiative Heat Transfer ◽

Inverse Analysis ◽

Radiative Heat ◽

Inverse Methods ◽

Heat Transfer Mode ◽

Inverse Approach ◽

Transfer Mode ◽

Industrial Problem

The design of heat transfer systems in which radiation is the dominant heat transfer mode is an important industrial problem. Compared to the conventional forward approach, the inverse approach allows a more thorough analysis of a potential design. This note demonstrates that inverse methods can be powerful tools in the analysis of radiative heat transfer systems.

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