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Falling Film of Ionic Liquid-Water Binary Solutions on a Uniformly Heated Vertical Wall

[+] Author and Article Information
Jing Peng, Ming-Ming Wang, Jiao Geng

You-Ting Wu1

Zhi-Bing Zhang1

Key Laboratory of Mesoscopic Chemistry of Ministry of Education, Department of Chemistry and Chemical Engineering,  Nanjing University, Nanjing, 210093 Chinasegz@nju.edu.cn

1

Corresponding authors.

J. Heat Transfer 134(1), 014502 (Nov 08, 2011) (5 pages) doi:10.1115/1.4004872 History: Received October 12, 2010; Revised August 09, 2011; Published November 08, 2011; Online November 08, 2011

The flow characteristics of falling film of amino acid ionic liquid (AAIL) aqueous solution on a uniformly heated vertical plane have been experimentally studied. The infrared images and temperature profiles have been determined and used to analyze the fluid flow. It is proven that the Marangoni effect exists widely and has significant influence on the flow region of falling film. A novel flow pattern is additionally observed when the mass fraction of AAIL is 30%. The flow patterns are also shown to be affected by the wall-liquid temperature differential, the flow rate and the concentration of solute. The experimental results of AAIL falling film are expected to be helpful for the further industrial application of ionic liquids.

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Figures

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Figure 1

Sketch of the experimental apparatus. Legends: (1) Pump, (2) overhead tank, (3) liquid spreader, (4) adjustable gap, (5) testing plate, (6) heater, (7) vessel, (8) reservoir, (9) infrared thermal camera system, (10) computer, (11) rotameter, (12) position line, (13) the upper edge of the heater, and (14) the lower edge of the heater, ○ T Pt-100 thermistor.

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Figure 2

Infrared images of 3% [N1111 ][Gly] solution versus wall-liquid temperature differential ΔT at Γ = 0.1 m3 /h. (a) T0 (Tw ) = 20(30) °C, (b) T0 (Tw ) = 20(50) °C, (c) T0 (Tw ) = 20(70) °C, (d) T0 (Tw ) = 30(30) °C, (e) T0 (Tw ) = 30(50) °C, and (f) T0 (Tw ) = 30(70) °C; scale bar I for (a) to (c) and II for (d) to (f).

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Figure 3

(a) Temperature profile along line LI01 in Fig. 2e; (b) widths of the films with different ΔT at x = 0.12 m, “x” represents the distance between the measuring point and the first position line

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Figure 4

Infrared images of the liquid films of 3% [N1111 ][Gly] solution versus flow rates at ΔT = 30 °C, T0  = 20 °C for: (1) Γ = 0.02 m3 /h, (2) Γ = 0.04 m3 /h, (3) Γ = 0.06 m3 /h, (4) Γ = 0.08 m3 /h, (5) Γ = 0.1 m3 /h, (6) Γ = 0.12 m3 /h, and at ΔT = 10 °C, T0  = 40 °C for: (7) Γ = 0.08 m3 /h. Scale bar I for (1) to (6) and II for (7).

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Figure 5

Variations of film areas with flow rates

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Figure 6

2D (a)-(c) and 3D (d)-(f) infrared images of the liquid films between the second and the third position lines with T0 (Tw ) = 20(50) °C, Γ = 0.12 m3 /h; (a) and (d): water; (b) and (e): 3% [N1111 ][Gly] aqueous solution; (c) and (f): 30% [N1111 ][Gly] aqueous solution

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Figure 7

(a) Infrared image of 30% [N1111 ][Gly] solution at T0 (Tw ) = 20(50) °C, Γ = 0.1 m3 /h; (b) temperature profiles along lines LI01, LI02, LI03, and LI04 in (a)

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