Strouhal Number
Strouhal Number - Related Videos
08:37
Isolation of Mouse Endometrial Epithelial and Stromal Cells for In Vitro Decidualization
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Cited by 77 •
2017
This study presents a standardized and validated method for the isolation and culture of primary mouse endometrial stromal and epithelial cells, which can be used in a coculture system to study in vitro decidualization.
05:52
An In Vitro Flow Investigation of the Effect of Stromal Cells on Leukocyte Recruitment
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2025
The video demonstrates a method for investigating the impact of stromal cells on leukocyte recruitment. In a parallel plate flow chamber model, pro-inflammatory cytokines induce the expression of adhesion receptors by endothelial cells, facilitating neutrophil recruitment and migration. The cross-talk between stromal cells and endothelial cells diminishes neutrophil recruitment to the endothelial cells.
09:05
A Novel Clinical Grade Isolation Method for Human Kidney Perivascular Stromal Cells
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Cited by 4 •
2017
Here we present a novel clinical grade isolation and culture method for kidney Perivascular Stromal Cells (kPSCs) based on whole organ perfusion with digestive enzymes and NG2-cell enrichment. With this method, it is possible to acquire sufficient cell numbers for cellular therapy.
09:15
Two Methods for Establishing Primary Human Endometrial Stromal Cells from Hysterectomy Specimens
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Cited by 14 •
2014
Establishing primary endometrial stromal cell culture systems from hysterectomy specimens is a valuable biological technique and a crucial step prior to pursuing a vast array of research aims. Here, we describe two methods used to establish stromal cultures from surgically resected endometrial tissues of human...
03:58
Generating Schwann Cell-Like Cells from Bone Marrow Stromal Cells
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2025
This video demonstrates a method for obtaining Schwann cell-like cells from multipotent bone marrow stromal cells (BMSCs). Initially, the BMSCs undergo hypoxia treatment, followed by directed differentiation into neuronal progenitor cells. Subsequently, specific media and culture conditions are employed to induce the transformation of these progenitor cells into Schwann cell-like cells.
FAQs
The frequency f represents the oscillation rate, L supplies the characteristic length, and U represents the flow velocity used for comparison. Because St = fL/U, increasing frequency or length increases the value, while increasing velocity decreases it when other quantities remain fixed. Selecting an appropriate characteristic length is therefore essential for meaningful comparisons between configurations.
It provides a compact way to relate the periodic frequency associated with vortex shedding to the body size and incoming-flow speed. This lets engineers compare shedding behavior when the body scale or operating condition changes, rather than relying on frequency alone. The resulting comparison supports assessment of periodic pressure fluctuations and their possible contribution to flow-induced vibration.
A dimensionless value allows results from different scales and operating conditions to be compared using a common parameter. In model testing, engineers can calculate the value for the model and compare it with the corresponding full-scale case. Similarity analysis then focuses on whether the unsteady-flow behavior is represented consistently, supporting more meaningful interpretation of experimental results.
Characteristic length sets the spatial scale against which the oscillation time is evaluated. In aerodynamic or hydrodynamic systems, using different length references changes the calculated value even when frequency and velocity are unchanged. Engineers must therefore state which dimension is used before comparing results, because inconsistent length choices can obscure differences in unsteady-flow behavior.
Begin by identifying the oscillation frequency f, the characteristic length L, and the relevant flow velocity U. Insert those quantities into St = fL/U, keeping the chosen length and velocity consistent with the flow case being studied. The calculated dimensionless result can then be compared across operating conditions, geometries, or scales to evaluate unsteady-flow behavior.
Engineers use it when periodic unsteady effects matter, including vortex shedding behind bluff bodies, flow-induced vibrations, and periodic pressure fluctuations. It also supports noise prediction and the design of structures intended to withstand or control unsteady-flow effects. The parameter is especially useful when a study must connect measured or expected oscillation behavior with geometry and flow speed.
The parameter supports noise prediction by linking an oscillation frequency with the characteristic length and flow velocity of the system. That relationship helps engineers identify and compare periodic behavior relevant to aerodynamic and hydrodynamic noise studies. In design, the same comparisons can guide efforts to withstand or control unsteady-flow effects associated with pressure fluctuations and flow-induced vibrations.