Sains Malaysiana 38(1): 119-124(2009)

 

 

Feedback Control of Thermocapillary Convection in a

Rotating Fluid Layer with Free-Slip Bottom

(Kawalan Suapbalik Olakan Termokapilari dalam Lapisan Bendalir

Berputar dengan Bawahnya Tergelincir)

 

 

Ishak Hashim

School of Mathematical Sciences, Universiti Kebangsaan Malaysia

43600 Bangi Selangor, Malaysia

 

Zailan Siri

Institute of Mathematical Sciences, University of Malaya

50603 Kuala Lumpur, Malaysia

 

 

Received:  2 May 2008 / Accepted: 20 June 2008

 

 

abstract

 

The linear stability theory is applied to investigate the effects of rotation and feedback control on the onset of steady and oscillatory thermocapillary convection in a horizontal fluid layer heated from below with a free-slip bottom. The thresholds and codimension-2 points for the onset of steady and oscillatory convection are determined. The effect of feedback control on the parameter space dividing the steady and oscillatory convection regions is demonstrated.

 

Keyword:  Feedback control; marangoni convection; rotation; surface tension; thermocapillary

 

 

 

ABSTRAK

 

Teori kestabilan linear digunakan untuk mengkaji kesan putaran dan kawalan suapbalik terhadap permulaan olakan termokapilari mantap dan berayun dalam lapisan mengufuk bendalir yang dipanaskan dari bawah dengan bawahnya tergelincir. Titik di ambang dan kodimensi-2 untuk permulaan olakan mantap dan berayun ditentukan. Kesan kawalan suapbalik terhadap ruang parameter  memisahkan rantau olakan mantap dan berayun ditunjukkan.

 

Kata kunci: Kawalan suapbalik; ketegangan permukaan; olakan marangoni; putaran; termokapilari  

 

 

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