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Draw resonance instability in coextr...

Lee, Woei-Shyong.

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Draw resonance instability in coextrusion fiber spinning.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Draw resonance instability in coextrusion fiber spinning./
作者:	Lee, Woei-Shyong.
面頁冊數:	162 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-07, Section: B, page: 2883.
Contained By:	Dissertation Abstracts International55-07B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9431977

Draw resonance instability in coextrusion fiber spinning.
Lee, Woei-Shyong.

Draw resonance instability in coextrusion fiber spinning. - 162 p.

Source: Dissertation Abstracts International, Volume: 55-07, Section: B, page: 2883.

Thesis (Ph.D.)--University of Florida, 1993.

The draw resonance instability of a bicomponent coextrusion fiber spinning has been studied theoretically and experimentally. For the theoretical analysis a simple model has been adopted in which a Newtonian and an upper-convected Maxwell fluid is the core and the skin layer, respectively. This model is chosen to investigate a two-phase flow in which the two fluids have quite different extensional rheology. The results indicate that the viscoelastic skin layer has a stabilizing influence in which the onset of draw resonance of a Newtonian fluid is delayed to a higher draw ratio by the coextrusion. An unexpected behavior of the coextrusion flow is predicted in that the highest draw ratio for a stable coextrusion spinning can be larger than that of the single-phase spinning of either fluid (Newtonian or upper-convected Maxwell) under certain conditions. In the experimental study a linear low-density polyethylene and a low-density polyethylene were used as the core and the skin, respectively. These materials have been chosen to simulate the flow situation considered in the theoretical investigation. While the theoretical model is too simple to provide a quantitative agreement with the experiment, various aspects of the experimental observations appear to be in qualitative agreement with the theoretical predictions.Subjects--Topical Terms:

1018531
Engineering, Chemical.

Draw resonance instability in coextrusion fiber spinning.
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035 $a (UnM)AAI9431977
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100 1 $a Lee, Woei-Shyong. $3 1907572
245 1 0 $a Draw resonance instability in coextrusion fiber spinning.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-07, Section: B, page: 2883.
500 $a Chairperson: Chang-Won Park.
502 $a Thesis (Ph.D.)--University of Florida, 1993.
520 $a The draw resonance instability of a bicomponent coextrusion fiber spinning has been studied theoretically and experimentally. For the theoretical analysis a simple model has been adopted in which a Newtonian and an upper-convected Maxwell fluid is the core and the skin layer, respectively. This model is chosen to investigate a two-phase flow in which the two fluids have quite different extensional rheology. The results indicate that the viscoelastic skin layer has a stabilizing influence in which the onset of draw resonance of a Newtonian fluid is delayed to a higher draw ratio by the coextrusion. An unexpected behavior of the coextrusion flow is predicted in that the highest draw ratio for a stable coextrusion spinning can be larger than that of the single-phase spinning of either fluid (Newtonian or upper-convected Maxwell) under certain conditions. In the experimental study a linear low-density polyethylene and a low-density polyethylene were used as the core and the skin, respectively. These materials have been chosen to simulate the flow situation considered in the theoretical investigation. While the theoretical model is too simple to provide a quantitative agreement with the experiment, various aspects of the experimental observations appear to be in qualitative agreement with the theoretical predictions.
520 $a A novel processing method has been developed for the fabrication of plastic optical fibers in which a modified coextrusion fiber spinning technique is used. Lab scale experiments have demonstrated that the new method is capable of fabricating defect-free clad fibers using several different types of materials. The new method is possible because the mechanics of the bicomponent spinning flow is controlled by the viscoelastic cladding material under typical spinning conditions as the process modeling study has indicated.
590 $a School code: 0070.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Plastics Technology. $3 1023683
650 4 $a Textile Technology. $3 1020710
690 $a 0542
690 $a 0795
690 $a 0994
710 2 0 $a University of Florida. $3 718949
773 0 $t Dissertation Abstracts International $g 55-07B.
790 1 0 $a Park, Chang-Won, $e advisor
790 $a 0070
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9431977