Research Article
Optimization of Airflow Profiles and Thermal Uniformity in a Cold Room at Negative Temperature
Abena Gabriel Brice*
,
Kewou Serge,
Gnepie Takam Nicolas Wilfried,
Tientcheu Nsiewe Maxwell,
Kuitche Alexis
Issue:
Volume 11, Issue 2, June 2026
Pages:
39-55
Received:
2 April 2026
Accepted:
11 April 2026
Published:
25 April 2026
Abstract: This study presents a CFD-based optimization of airflow and thermal uniformity in a negative-temperature cold storage room (6.8 × 2.4 × 3 m), simulated using ANSYS 19.4 with the Realizable k-ε turbulence model. Four pallet loading configurations were evaluated on a computational mesh of 470,780 elements, with convergence residuals ≤ 10-5. Boundary conditions included a supply air temperature of 248.15 K (−25°C), an inlet velocity of 4 m/s, and an ambient external temperature of 303.15 K (30°C). Baseline simulations showed pallet surface temperatures ranging from 250.4 K to 256.4 K, resulting in a maximum thermal non-uniformity of ΔT = 6 K. Stagnant zones exhibited velocities below 0.5 m/s, with longitudinal velocity dropping to 0.2 m/s at z = 6 m. In Case 2, a thermal gradient of approximately 6 K was observed between the top and center of the storage zone. Peak temperatures reached 257.3 K in low-velocity regions, where airflow between pallets fell below 0.25 m/s. In Case 3, jet velocities reached up to 10 m/s at the evaporator outlet but decayed to below 1 m/s upon entering the storage zone. Product temperatures subsequently rose to 264 K at z > 4 m. The optimized configuration (Case 4) featured a stepped pallet arrangement with 0.1 m inter-pallet spacing and an increased supply velocity of 12.4 m/s. This reduced the maximum temperature difference to ΔT = 2.4 K (249.3 K – 251.7 K), representing a 60% improvement in thermal homogeneity. Longitudinal velocity at the chamber bottom improved from 0.2 m/s to 1.2 m/s (+500%), and vertical thermal stratification decreased from 5.6 K to 2.0 K (−64%). Critically, iso-clip analysis confirmed that hot zones exceeding 255 K were virtually eliminated in the optimized case.
Abstract: This study presents a CFD-based optimization of airflow and thermal uniformity in a negative-temperature cold storage room (6.8 × 2.4 × 3 m), simulated using ANSYS 19.4 with the Realizable k-ε turbulence model. Four pallet loading configurations were evaluated on a computational mesh of 470,780 elements, with convergence residuals ≤ 10-5. Boundary ...
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Research Article
Evaluation of Glycemic Index, Antinutritional and Sensory Properties of Fufu from Blends of Aerial Yam (AYF), Finger Millet (FMF) and Pro-Vitamin A Cassava Flours (PVACF)
Nwabueze Joseph Mbam*,
Francis Chiwendu Ekwu,
Odo Micheal Odo,
Gloria Ijeoma Gibson-Umeh,
Ogah Anselem Ogah,
Ugwu Ifeoma Mary
Issue:
Volume 11, Issue 2, June 2026
Pages:
56-66
Received:
17 March 2026
Accepted:
28 March 2026
Published:
29 April 2026
Abstract: The study x-rays the evaluation of glycemic index, Antinutritional and sensory properties of fufu blends of Aerial yam (Dioscorea bulbifera), finger millet (Eleusine coracana) and pro vitamin A cassava (Manihot esculanta “Yellow cassava”). The experiments were conducted using the simplex centroid design, 14 formulations were obtained using mixture response surface methodology as the optimizing technique. The formulated flour blends showed that there was significant difference (P<0.05) between the range of values 51.77-56.03 for Glycemic index and 14.14 -21.08 Glycemic load respectively. The anti-nutrients showed tannin, phytate, oxalate and total phenolic contents of 0.35-3.39, 1.07- 6.57, 0.84 - 3.43, and 0.59- 1.91mg/100g respectively. Significant differences did not exist (P>0.05) amongst the observed values for tannin, phytate, oxalate and phenol content. Results of the fufu blends revealed sensory score of the flour blends fufu for appearance, taste, mould ability, stickiness, consistency, colour and overall acceptability were 4.69-7.34; 4.02-5.57; 5.79-8.21; 3.80-7.71; 5.84-8.53; 2.33-7.13; and 6.33-8.20 respectively. The study showed that flour blends from aerial yam flour (AYF), finger millet flour (FMF) and pro vitamin A cassava flour (PVACF) have great potentials in the production of fufu with wide range of nutritional and sensory attributes, therefore can be used as nutritious and convenient functional foods. Enabling a new product (starch flour) source for the development of food products that can reduce dependence on other starch sources such as corn and rice.
Abstract: The study x-rays the evaluation of glycemic index, Antinutritional and sensory properties of fufu blends of Aerial yam (Dioscorea bulbifera), finger millet (Eleusine coracana) and pro vitamin A cassava (Manihot esculanta “Yellow cassava”). The experiments were conducted using the simplex centroid design, 14 formulations were obtained using mixture ...
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Research Article
Challenges of Logistics and Supply Chain Management in Bangladesh’s Textile Industry
Issue:
Volume 11, Issue 2, June 2026
Pages:
67-80
Received:
27 April 2026
Accepted:
8 May 2026
Published:
26 May 2026
DOI:
10.11648/j.ajset.20261102.13
Downloads:
Views:
Abstract: This study examines Challenges of Logistics and Supply Chain Management in Bangladesh’s Textile Industry with the objective of identifying key inefficiencies and proposing strategies to improve operational performance and sustainability. The study adopts a mixed-method approach, including qualitative and quantitative analysis, based on both primary data (survey and interviews with industry professionals) and secondary data (reports, journals, and industry publications), to analyze critical areas such as transportation, inventory management, lead time, infrastructure limitations, and coordination among supply chain stakeholders within the context of Bangladesh’s textile sector. In addition, the study incorporates the significance, rationale, and conceptual advancement of previous research to establish a comprehensive analytical framework. It also includes the significance, rationale and conceptual advance of the previous work. The findings indicate that poor infrastructure, port congestion, inefficient transportation systems, lack of technological integration, and weak coordination among stakeholders significantly hinder supply chain efficiency, resulting in increased costs and delays. The study contributes to both academic and practical fields by providing a deeper understanding of existing logistics challenges and offering strategic recommendations, including digitalization, improved infrastructure, better supply chain integration, and policy support. It may assist industry stakeholders, policymakers, and practitioners in enhancing decision-making, improving operational efficiency, and strengthening the overall competitiveness of Bangladesh’s textile industry. Effective SCM in the textile industry leads to reduced inventory, lower costs, increased productivity, faster delivery, higher profits, and better customer loyalty. Additionally, the study highlights several challenges faced by Bangladesh’s textile industry, such as poor communication, limited SCM visibility, and long lead times, which could provide opportunities for future research to improve the sector. This research paper will give the concept of the overall processing of the textile industry of Bangladesh.
Abstract: This study examines Challenges of Logistics and Supply Chain Management in Bangladesh’s Textile Industry with the objective of identifying key inefficiencies and proposing strategies to improve operational performance and sustainability. The study adopts a mixed-method approach, including qualitative and quantitative analysis, based on both primary...
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