경사판위를 흐르는 자연대류의 전기화학적 방법에 의한 실험적 연구

전영호; 최창균

HWAHAK KONGHAK, Vol.30, No.1, 26-33, February, 1992

Export Citation

경사판위를 흐르는 자연대류의 전기화학적 방법에 의한 실험적 연구

Experimental Study of Natural Convection over Inclined Plates by Electrochemical Technique

전영호, 최창균

초록

경사판위의 자연대류 물질전달 실험을 전기화학적 방법으로 수행하였다. 본 목적을 위하여 한계전류하에서 구리전극 및 황산구리-황산 전해액을 사용하였다. 실험결과 층류 자연대류 유동에서 2차적인 정규와동의 발생 조건을 나타내는 임계 Rayleigh 수는 수직으로부터의 경사각이 증가함에 따라서 현저히 감소되고, 정규와동의 파장은 경사각에 거의 무관함을 알 수 있었다.

Experiments on natural convection mass transfer adjacent to upward-facing inclined plates were performed by employing an electrochemical technique. For this purpose copper electrodes and an aqueous solution of cupric sulfate and sulphuric acid were used under limiting currents. Experiments showed that the Rayleigh number marking the onset of secondary flow in the form of vortex rolls in the primary natural convection varies markedly with the angle of inclination, decreasing with increasing departures from vertical, and that the vortex wavelength is almost independent of the surface inclination.

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[1] Wagner C, J. Electrochem. Soc., 95, 161 (1949)

[2] Eisenberg M, Tobias CW, Wilke CR, J. Electrochem. Soc., 100, 513 (1953)

[3] Fouad MG, Ahamed AM, Electrochim. Acta, 14, 651 (1969)

[4] Lloyd JR, Sparrow EM, Eckert ERG, Int. J. Heat Mass Transf., 15, 457 (1972)

[5] Wilke CR, Tobias CW, Eisenberg M, Chem. Eng. Prog., 49, 457 (1953)

[6] Sealman JR, Tarakoli-Attar J, J. Electrochem. Soc., 127, 1049 (1980)

[7] Fenech EJ, Tobias CW, Electrochim. Acta, 2, 311 (1960)

[8] Wilke CR, Eisenberg M, Tobias CW, J. Electrochem. Soc., 100, 513 (1953)

[9] Ibl N, Braun U, Chimia, 21, 404 (1967)

[10] Selman JR, Newman J, J. Electrochem. Soc., 118, 1070 (1971)

[11] Chun YH, Choi CK, HWAHAK KONGHAK, 29(3), 381 (1991)

[12] Sparrow EM, Husar RB, J. Fluid Mech., 37, 251 (1969)

[13] Lloyd JR, Sparrow EM, J. Fluid Mech., 42, 465 (1970)

[14] Hwang GJ, Cheng KC, Can. J. Chem. Eng., 51, 659 (1973)

[15] Cheng KC, Kim YW, J. Heat Transfer, 110, 608 (1988)

[16] Black WC, Norris JK, Int. J. Heat Mass Transf., 18, 43 (1975)

[17] Lloyd JR, Proc. 5th Int. Heat Transfer Conf., Tokyo, 3, 34 (1974)