Design and simulation of fluid flow in paper based microfluidic platforms

Madhu, Nidhin T.; Resmi, P.; Pradeep, Aarathi; Babu, T G Satheesh

doi:10.1088/1757-899x/577/1/012104

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…For finding m sat , we measures the weight of the filter paper before and after the experiment and took the difference between the two readings. After performing multiple experiments, we got an average porosity value as 0.776, which is comparable with the earlier measurements of porosity for Whatman grade 4 filter paper. − …”

Section: Experimental and Numerical Proceduressupporting

confidence: 84%

“…After performing multiple experiments, we got an average porosity value as 0.776, which is comparable with the earlier measurements of porosity for Whatman grade 4 filter paper. 40 − 42 …”

Section: Experimental and Numerical Proceduresmentioning

confidence: 99%

“…The Whatman grade 4 paper strip used in the present work is superhydrophilic; thus, a value of 0° is considered. A similar value of a superhydrophilic filter paper (0° static contact angle) is also used in the earlier literature. , The initial value of the volume fraction s 2 is taken as 0.985. To combine the functionality of Darcy’s law and phase transport in porous medium interfaces, we used the multiphase flow in porous medium interface.…”

Section: Experimental and Numerical Proceduresmentioning

confidence: 99%

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Liquid Wicking in a Paper Strip: An Experimental and Numerical Study

Mahapatra

2020

ACS Omega

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In this decade, paper-based microfluidics has gained more interest in the research due to the vast applications in medical diagnosis, environmental monitoring, food safety analysis, etc. In this work, we presented a set of experiments to understand the physics of the capillary flow phenomenon through paper strips. Here, using the wicking phenomenon of the liquid in porous media, experimentally, we find out the capillary height of the liquid in filter paper at different time intervals. It was found that the Lucas–Washburn (L–W) model, as well as the evaporation model, fails to predict the capillary rise accurately. However, the detailed numerical solution shows a better similarity with the experimental results. We have also shown the different regimes of the wicking phenomenon using scaling analysis of the modified L–W model. The capillary rise method was applied to detect the added water content in milk. We used milk as a liquid food and found the added water content from the change in the capillary height at different concentrations of milk. Finally, results obtained from the paper-based device were verified with the commercially available lactometer data.

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Section: Experimental and Numerical Proceduressupporting

confidence: 84%

Section: Experimental and Numerical Proceduresmentioning

confidence: 99%

Section: Experimental and Numerical Proceduresmentioning

confidence: 99%

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Liquid Wicking in a Paper Strip: An Experimental and Numerical Study

Mahapatra

2020

ACS Omega

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“…We found the average porosity value of 0.776 after multiple experiments and the average permeability value of 1.06 × 10 −11 , which are comparable with the values in the literature. 12,24,48,49,57 To know the accuracy of the experimental process, we also find the relation of wicking mass (m) with time (t) and height (h), which are comparable with the conventional relation (m ∝ h) mentioned in the literature. 58 The experimental setup for measuring the wicking mass is developed by utilizing two weighing balances (Pioneer, Ohaus).…”

Section: Respectively the Expression For Finding T H E P O R O S I T ...supporting

confidence: 79%

Imbibition of Liquids through a Paper Substrate in a Controlled Environment

Mahapatra

2022

Langmuir

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Liquid spreading on open surfaces is a widely observed phenomenon. The physics of liquid spreading has become more complex when the surface is porous like paper or fabrics due to the evaporation of the liquid and swelling of the fibers. In this study, we have performed liquid imbibition experiments on paper strips in a controlled environment with and without using hydrophobic boundaries. The experimental results are compared to the existing analytical models that account for each effect separately. The existing models were found to be inaccurate in predicting the experimental results. We developed new analytical models by modifying existing models to predict the capillary rise of the liquid through the paper substrate accurately. Different effects, such as the barrier (hydrophobic boundary), evaporation, and swelling, are considered simultaneously while developing the modified models to mimic the exact practical situation for the first time. We discovered that the modified models predict the experimental results more accurately than the existing models. For cases with and without barriers, the final models considering several effects simultaneously predict the data with a maximum error range of 7 and 10%, respectively. Finally, we conducted capillary rise experiments with volatile (water) and non-volatile (silicon oil) liquids at various temperatures and under various relative humidity conditions to validate the analytical results.

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“…parameters. 40,41 Because the evaporation rate for a saturated, porous material behaves like that of a free surface of water, 42 the ambient evaporation rate was set as 0.1 μL min −1 for a circular slice of material with R = 0.5 cm. 43 While r o is a simple geometric parameter, K 1 is influenced by a variety of factors including airflow speed, air flow temperature etc.…”

Section: P Rmentioning

confidence: 99%