Farklı ön işlem uygulanan Ahlatın kuruma ve büzülme davranışının modellenmesi

Yıl 2018, , 1231 - 1246, 19.12.2018

İnci Türk Toğrul , Rabiya Safiye Çelebi Hasan Toğrul

https://doi.org/10.17341/gazimmfd.416456

Cited By: 2

Öz

Bu çalışmada yaban armudu olarak bilinen ahlatlar (pyrus eleagrifolia), laboratuar tipi kurutucuda 4 farklı sıcaklıkta (75 ^oC- 45 ^oC) ön işlemsiz ve 10 ayrı ön işlem uygulanarak kurutuldu. Ön işlem çözeltileri olarak, 65 brixlik maltoz, sakaroz, glikoz, maltodekstrin, sorbitol, %65 sakaroz-%10 tuz, %5 lik Na₂SO₅, %2 EO %5 Na₂SO₅, %5 K₂SO₅ ve %2 EO %5K₂SO₅ çözeltileri kullanıldı. Ahlatların zamanla boyutsuz nem içeriğindeki ve nem içeriği ile kuruma hızındaki değişim incelendi. Azalan kuruma hızı dönemi için karakteristik taşınım katsayısı olan difüzyon katsayısı tüm sıcaklık ve ön işlemler için büzülmenin dikkate alındığı ve alınmadığı durumlar için hesaplandı. Büzülmenin dikkate alınmasıyla daha düşük difüzyon katsayıları ve daha düşük aktivasyon enerjisi elde edildi.  Ahlatın zamanla boyutsuz nem içeriğindeki değişim literatürde yaygın olarak kullanılan 5 model (Newton, Page, Henderson-Pabis, Logaritmik ve Midilli modelleri) kullanılarak modellendi. Model katsayıları p<0,05 anlamlılık düzeyinde test edildi. Modellerin ölçüm değerleri ile uygunluğu R² ve c² testleriyle incelendi. Önişlemsiz, maltoz, glikoz, sakaroz, sakaroz-tuz, %5 Na₂S₂O₅, %2 EO %5 Na₂S₂O₅ ve %5 K₂S₂O₅ işlemlerinde Logaritmik modelin, sorbitol, maltodekstrin ve %2 EO %5K₂S₂O₅ işlemlerinde Newton modellerinin en uygun olduğu görüldü. Ahlatın kuruması sırasında meydana gelen büzülme literatürdeki 6 büzülme modeliyle incelendi. Büzülmeyi açıklamada doğrusal ve exponansiyel modellerin diğer modellere göre daha uygun olduğu görüldü.

Anahtar Kelimeler

Ahlat, Kurutma, Ön işlem, Difüzyon Katsayısı, Modelleme

Kaynakça

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